Readme updates

Author: dibarbet

README.md

@@ -1,4 +1,6 @@
-## C# for Visual Studio Code (powered by OmniSharp)
+## C# for Visual Studio Code
+
+C# is the feature-rich, language support for C# in VS Code. This extension is being updated to be powered by a new fully open-source Language Server Protocol (LSP) Host.  To use the LSP-powered version, click on the “Switch to Pre-Release Version” or “Install Pre-Release” button or above. To use the OmniSharp-powered version, click “Install Release Version” or continuing using the 1.x version you already have installed.
 
 Welcome to the C# extension for Visual Studio Code! This extension provides the following features inside VS Code:
 

images/csharpIcon.png

@@ -2,7 +2,7 @@
   "name": "csharp",
   "publisher": "ms-dotnettools",
   "version": "1.25.8",
-  "description": "C# for Visual Studio Code (powered by OmniSharp).",
+  "description": "Base language support for C#",
   "displayName": "C#",
   "author": "Microsoft Corporation",
   "license": "SEE LICENSE IN RuntimeLicenses/license.txt",