Added files for contributions, maintainers and DCO

CONTRIBUTING.md

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+# Contribution Guidelines
+
+## Introduction
+
+This document explains how to contribute changes to the Gitea
+project.  It assumes you have followed the [installation
+instructions](https://github.com/go-gitea/docs/tree/master/en-US/installation)
+
+Sensitive security-related issues should be reported to
+[security@gitea.io](mailto:security@gitea.io).
+
+## Bug reports
+
+Please search the issues on the issue tracker with a variety of keywords
+to ensure your bug is not already reported.
+
+If unique, [open an issue](https://github.com/go-gitea/gitea/issues/new)
+and answer the questions so we can understand and reproduce the
+problematic behavior.
+
+The burden is on you to convince us that it is actually a bug
+in Gitea. This is easiest to do when you write clear, concise
+instructions so we can reproduce the behavior (even if it seems
+obvious). The more detailed and specific you are, the faster
+we will be able to help you. Check out [How to Report Bugs
+Effectively](http://www.chiark.greenend.org.uk/~sgtatham/bugs.html).
+
+Please be kind, remember that Gitea comes at no cost to you, and you're
+getting free help.
+
+## Discuss your design
+
+The project welcomes submissions but please let everyone know what
+you're working on if you want to change or add something to the Gitea
+repositories.
+
+Before starting to write something new for the Gitea project, please
+[file an issue](https://github.com/go-gitea/gitea/issues/new).
+Significant changes must go through the [change proposal
+process](https://github.com/go-gitea/proposals) before they can be
+accepted.
+
+This process gives everyone a chance to validate the design, helps
+prevent duplication of effort, and ensures that the idea fits inside
+the goals for the project and tools.  It also checks that the design is
+sound before code is written; the code review tool is not the place for
+high-level discussions.
+
+## Testing redux
+
+Before sending code out for review, run all the tests for the whole
+tree to make sure the changes don't break other usage and keep the
+compatibility on upgrade:
+
+After running for a while, the command should print
+
+```
+ALL TESTS PASSED
+```
+
+## Code review
+
+Changes to Gitea must be reviewed before they are accepted, no matter
+who makes the change even if an owners or a maintainer.  We use github's
+pull request workflow to do that and use [lgtm](http://lgtm.co) to ensure
+every PR is reviewed by at least 2 maintainers.
+
+## Sign your work
+
+The sign-off is a simple line at the end of the explanation for the
+patch. Your signature certifies that you wrote the patch or otherwise
+have the right to pass it on as an open-source patch. The rules are
+pretty simple: If you can certify [DCO](DCO), then you just add a line
+to every git commit message:
+
+```
+Signed-off-by: Joe Smith <joe.smith@email.com>
+```
+
+Please use your real name, we really dislike pseudonyms or anonymous
+contributions. We are in the opensource world without secrets. If you
+set your `user.name` and `user.email` git configs, you can sign your
+commit automatically with `git commit -s`.
+
+## Contributors
+
+Everyone who sent a PR to Gitea that gets accepted will
+be as a contributor. Please send a PR to add your name to
+[CONTRIBUTORS](CONTRIBUTORS). For the format, see the
+[CONTRIBUTORS](CONTRIBUTORS).
+
+## Maintainers
+
+To make sure every PR have been checked, we make a team maintainers. Any
+PR MUST be reviewed and by at least two maintainers before it can
+get merged.  Maintainers should be a contributor of gitea(or gogs) and
+contributed at least 4 accepted PRs. And a contributor should apply as a
+maintainer in [gitter Gitea develop](https://gitter.im/go-gitea/develop).
+And the owners or the team maintainer could invite the contributor. A
+maintainer should spend some time on code reviews. If some maintainer
+have no time to do that, he should apply to leave maintainers team and
+we will give him an honor to be as a member of advisor team. Of course,
+if an advisor have time to code view, welcome it back to maintainers team.
+If some one have no time to code view and forget to leave the maintainers,
+the owners have the power to move him from maintainers team to advisors
+team.
+
+## Owners
+
+Since Gitea is a pure community organization without any company
+support, to keep the development healthly We will elect the owners every
+year. Every time we will elect three owners.  All the contributers could
+vote for three owners, one is the main owner, the other two are assistant
+owners. When the new owners have been elected, the old owners MUST move
+the power to the new owners.  If some owner don't obey these rules,
+the other owners are allowed to revoke his owner status.
+
+After the election, the new owners should say he agrees with these
+rules on the [CONTRIBUTING](CONTRIBUTING.md) on the [Gitter Gitea
+Channel](https://gitter.im/go-gitea/gitea). Below is the word to speak
+
+```
+I'm glad to be an owner of Gitea,
+I agree with [CONTRIBUTING](CONTRIBUTING.md).
+I will spend part of my time on gitea
+and lead the development of gitea.
+```
+
+For a honor to the owners, this document will add the history owners
+below:
+
+2016-11-04 ~ 2017-12-31
+
+- lunny <xiaolunwen@gmail.com>
+- tboerger <thomas@webhippie.de>
+- bkcsoft <kim.carlbacker@gmail.com>
+
+## Versions
+
+Gitea has one master as a tip branch and have many version branch
+such as v0.9. v0.9 is a release branch and we will tag v0.9.0 both for
+binary download.  If v0.9.0 have some bugs, we will accept PR on v0.9
+and publish v0.9.1 and merge bug PR to master.
+
+Branch master is a tip version, so if you wish a production usage,
+please download the latest release tag version. All the branch will be
+protected via github, All the PRs to all the branches should be review
+by two maintainers and pass the automatic tests.
+
+## Copyright
+
+Code that you contribute should use the standard copyright header:
+
+```
+// Copyright 2016 - 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+```
+
+Files in the repository are copyright the year they are added and the
+year they are last changed. If the copyright author is changed, just
+copy the head below the old one.

CONTRIBUTORS

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+Andrey Nering <nobody@nobody.tld> (@andreynering)
+Kim Carlbäcker <kim.carlbacker@gmail.com> (@bkcsoft)
+LefsFlare <nobody@nobody.tld> (@LefsFlarey)
+Lunny Xiao <xiaolunwen@gmail.com> (@lunny)
+Rachid Zarouali <nobody@nobody.tld> (@xinity)
+Rémy Boulanouar <admin@dblk.org> (@DblK)
+Sandro Santilli <strk@kbt.io> (@strk)
+Thibault Meyer <nobody@nobody.tld> (@0xbaadf00d)
+Thomas Boerger <thomas@webhippie.de> (@tboerger)

DCO

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+Developer Certificate of Origin
+Version 1.1
+
+Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
+660 York Street, Suite 102,
+San Francisco, CA 94110 USA
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+
+Developer's Certificate of Origin 1.1
+
+By making a contribution to this project, I certify that:
+
+(a) The contribution was created in whole or in part by me and I
+    have the right to submit it under the open source license
+    indicated in the file; or
+
+(b) The contribution is based upon previous work that, to the best
+    of my knowledge, is covered under an appropriate open source
+    license and I have the right under that license to submit that
+    work with modifications, whether created in whole or in part
+    by me, under the same open source license (unless I am
+    permitted to submit under a different license), as indicated
+    in the file; or
+
+(c) The contribution was provided directly to me by some other
+    person who certified (a), (b) or (c) and I have not modified
+    it.
+
+(d) I understand and agree that this project and the contribution
+    are public and that a record of the contribution (including all
+    personal information I submit with it, including my sign-off) is
+    maintained indefinitely and may be redistributed consistent with
+    this project or the open source license(s) involved.

MAINTAINERS

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+Andrey Nering <nobody@nobody.tld> (@andreynering)
+Kim Carlbäcker <kim.carlbacker@gmail.com> (@bkcsoft)
+LefsFlare <nobody@nobody.tld> (@LefsFlarey)
+Lunny Xiao <xiaolunwen@gmail.com> (@lunny)
+Matthias Loibl <mail@matthiasloibl.com> (@metalmatze)
+Rachid Zarouali <nobody@nobody.tld> (@xinity)
+Rémy Boulanouar <admin@dblk.org> (@DblK)
+Sandro Santilli <strk@kbt.io> (@strk)
+Thibault Meyer <nobody@nobody.tld> (@0xbaadf00d)
+Thomas Boerger <thomas@webhippie.de> (@tboerger)