Merge pull request #120 from OliaG/roadmap-doc

Add roadmap doc

Documentation/roadmap.md

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+# WinForms on .NET Core Roadmap
+
+With the introduction of .NET Core 3, WinForms exists as one of [several
+layers](https://github.com/dotnet/core/blob/master/Documentation/core-repos.md)
+of .NET Core.  Although .NET Core is cross-platform, WinForms relies heavily on
+Windows-specific platform pieces and for now will remain Windows only.
+
+At present, our team's primary focus is making additional components of WinForms
+available as open source in this repo, ensuring functional parity with the
+WinForms as it currently exists .NET Framework, and adding the ability to run
+tests publicly so we can accept PRs from the open source community. Here are our
+short-term and long-term goals.
+
+## Short-Term
+
+* Port existing functional tests and test infrastructure to this repo
+* Add Application property for DPI Awareness setting
+
+## Long-Term
+
+* Add WinForms Designer support for .NET Core 3 projects in Visual Studio
+* Fix existing scaling bugs in Per Monitor DPI aware applications
+* Add a new “clean" way of calculating location/size information in PMA mode.
+* Make new projects be per monitor aware
+* Add Edge browser control
+* Add Data Visualization controls
+* Improve accessibility support for some missing UIA interfaces
+* Improve performance of WinForms runtime
+
+For general information regarding .NET Core plans, see [.NET Core
+roadmap](https://github.com/dotnet/core/blob/master/roadmap.md).  
+
+## Timeline for Open Source
+
+| Milestone | Release Date |
+|---|---|
+|Initial launch of WinForms on .NET Core repository |Dec 4, 2018|
+|Functional parity with .NET Framework WinForms |Q1 2019|
+|First version of open source WinForms|.NET Core GA|
+|Designer support in Visual Studio|Update to VS 2019|
+
+If you'd like to contribute to WinForms, please take a look at our [Contributing
+Guide](https://github.com/dotnet/winforms/blob/master/Documentation/contributing-guide.md).