Add detail to readme, based on WPF, WinForms, and CoreFX (#6)

Author: dagood

README.md

@@ -3,9 +3,57 @@
 This repo contains the code to build the .NET Windows Desktop Runtime for all
 supported platforms.
 
+## Getting started
+
+* [.NET Core 3.0 SDK](https://dotnet.microsoft.com/download/dotnet-core/3.0)
+* [Windows Forms repository](https://github.com/dotnet/winforms)
+* [WPF repository](https://github.com/dotnet/wpf)
+
+## How to Engage, Contribute and Provide Feedback
+
+Some of the best ways to contribute are to try things out, file bugs, join in
+design conversations, and fix issues.
+
+* This repo defines [contributing guidelines](CONTRIBUTING.md) and also follows
+  the more general [.NET Core contributing
+  guide](https://github.com/dotnet/coreclr/blob/master/Documentation/project-docs/contributing.md).
+* If you have a question or have found a bug, [file an
+  issue](https://github.com/dotnet/windowsdesktop/issues/new).
+
+### Reporting security issues and security bugs
+
+Security issues and bugs should be reported privately, via email, to the
+Microsoft Security Response Center (MSRC) <secure@microsoft.com>. You should
+receive a response within 24 hours. If for some reason you do not, please follow
+up via email to ensure we received your original message. Further information,
+including the MSRC PGP key, can be found in the [Security
+TechCenter](https://www.microsoft.com/msrc/faqs-report-an-issue).
+
+Also see info about related [Microsoft .NET Core and ASP.NET Core Bug Bounty
+Program](https://www.microsoft.com/msrc/bounty-dot-net-core).
+
+### .NET Framework issues
+
+Issues with .NET Framework should be filed on [VS developer
+community](https://developercommunity.visualstudio.com/spaces/61/index.html), or
+[Product Support](https://support.microsoft.com/en-us/contactus?ws=support).
+They should not be filed on this repo.
+
+## Code of Conduct
+
+This project uses the [.NET Foundation Code of
+Conduct](https://dotnetfoundation.org/code-of-conduct) to define expected
+conduct in our community. Instances of abusive, harassing, or otherwise
+unacceptable behavior may be reported by contacting a project maintainer at
+conduct@dotnetfoundation.org.
+
+## License
+
+.NET Core (including the WindowsDesktop repo) is licensed under the [MIT license](LICENSE.TXT).
+
 ## Officially Released Builds
 
-They can be downloaded from [here](https://www.microsoft.com/net/download#core).
+Download official .NET Core releases [here](https://www.microsoft.com/net/download#core).
 
 ## Daily Builds