Add community docs (#4067)

* Added PR template, Code of Conduct doc and Contributing guidance doc as per community guidelines.

* Amends for code of conduct

* Readded deleted files

.github/PULL_REQUEST_TEMPLATE.md

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+Fixes #<!-- If this addresses a specific issue, please provide the issue number here -->
+
+## Description
+<!-- Please discuss the changes you have worked on. What do the changes do; why is this PR needed? -->
+
+## Specific Changes
+<!-- Please list the changes in a concise manner. -->
+
+  - 
+  -
+  -
+
+## Testing
+<!-- If you are adding a new feature to a library, you must include tests for your new code. -->

CODE_OF_CONDUCT.md

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+## Code of Conduct
+
+This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/). 
+For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact
+ [opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional questions or comments.

Contributing.md

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+# Instructions for Contributing Code
+
+## Contributing bug fixes and features
+
+The Bot Framework team is currently accepting contributions in the form of bug fixes and new 
+features. Any submission must have an issue tracking it in the issue tracker that has
+ been approved by the Bot Framework team. Your pull request should include a link to 
+ the bug that you are fixing. If you've submitted a PR for a bug, please post a 
+ comment in the bug to avoid duplication of effort.
+
+## Legal
+
+If your contribution is more than 15 lines of code, you will need to complete a Contributor 
+License Agreement (CLA). Briefly, this agreement testifies that you are granting us permission
+ to use the submitted change according to the terms of the project's license, and that the work
+  being submitted is under appropriate copyright.
+
+Please submit a Contributor License Agreement (CLA) before submitting a pull request. 
+You may visit https://cla.azure.com to sign digitally. Alternatively, download the 
+agreement ([Microsoft Contribution License Agreement.docx](https://www.codeplex.com/Download?ProjectName=typescript&DownloadId=822190) or
+ [Microsoft Contribution License Agreement.pdf](https://www.codeplex.com/Download?ProjectName=typescript&DownloadId=921298)), sign, scan, 
+ and email it back to <cla@microsoft.com>. Be sure to include your github user name along with the agreement. Once we have received the 
+ signed CLA, we'll review the request.