Updated broken links in ./README.md (#277)

* Updated broken links in ./README.md

* Fixed wrong name of README.md

* PR feedback

README.md

@@ -22,16 +22,7 @@ Official Starting Page: https://dotnet.microsoft.com/
 
 We welcome contributions! Many people all over the world have helped make this project better.
 
-* If you have a question or idea, [file a new issue](https://github.com/dotnet/runtime/issues/new).
-
-	* Is your feedback for .NET Framework? This repo is for .NET Core. If you are having issues with the "full" .NET Framework (also called "Desktop"), the best way to file a bug is the [Report a Problem](https://aka.ms/vs-rap) tool, which is integrated with the [VS Developer Community Portal](https://developercommunity.visualstudio.com/); or through [Product Support](https://support.microsoft.com/en-us/contactus?ws=support) if you have a contract.
-
-* If you want to contribute a fix or improvement, you'll want to check out these links
-
-    * Requirements to build this repo ([Linux](docs/building/linux-requirements.md), [macOS](docs/building/macos-requirements.md), [Windows](docs/building/windows-requirements.md))
-    * What kind of contributions you might want to make [in the runtime](docs/coreclr/project-docs/contributing.md) and [in the libraries](docs/libraries/project-docs/contributing.md)
-	* [How you can make a change happen!](docs/coreclr/project-docs/contributing-workflow.md)
-	* How to build and test your change [in the runtime](docs/coreclr/project-docs/developer-guide.md) and [in the libraries](docs/libraries/project-docs/developer-guide.md)
+For further information see [Contributing](CONTRIBUTING.md).
 
 ## Reporting security issues and security bugs
 
@@ -893,4 +884,4 @@ General .NET OSS discussions: [.NET Foundation forums](https://forums.dotnetfoun
 
 ## License
 
-.NET (including the runtime repo) is licensed under the [MIT](LICENSE) license.
+.NET (including the runtime repo) is licensed under the [MIT](LICENSE.TXT) license.