Update README.md to reference the OmniSharp extension

README.md

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-Don't install this extension unless you want to try an early version. 
-
-This is a preview of C# support in Visual Studio code. It is designed to work well with the upcoming [.NET Core 1.0](http://dotnet.github.io/). 
+This is a preview of C# support in Visual Studio code. It is designed to work well with [.NET Core 1.0](http://dotnet.github.io/). 
 These new projects are based on project.json and the [.NET CLI](https://dotnet.github.io/getting-started/).
 
+### Support for .csproj
+
+Support for .csproj projects will be improved in future versions of this extension. For now, if you are targeting Mono scenarios (ex: Unity 
+or Xamarin) we suggest instead installing the 'Built-in Omnisharp' extension. Note that the name of the Omnisharp extension is no longer 
+correct - the extension is no longer built into VS Code.
+
+Installation steps for the Omnisharp extension --
+
+1. Install ASP.NET 5 RC1 (NOTE: Do **NOT** use RC2)
+    * Windows: https://docs.asp.net/en/1.0.0-rc1/getting-started/installing-on-windows.html
+    * OSX: https://docs.asp.net/en/1.0.0-rc1/getting-started/installing-on-mac.html. Follow the instructions for using Mono.
+    * Linux: https://docs.asp.net/en/1.0.0-rc1/getting-started/installing-on-linux.html. Follow the instructions for using Mono.
+2. Bring up the extension list in VS Code by opening the command pallet (F1 key) and type 'ext install'.
+3. After VS Code has downloaded the extension list, type 'omnisharp' and select 'Built-in Omnisharp' from the list.
+4. Open a C# file. If intellisense isn't working, open the output window (View->Toggle Output) and look at the 'OmniSharp Log'.
+
 ### Debugging
 This version supports basic debugging capabilities.
 See http://aka.ms/vscclrdebugger for details.