Update README.md with basic project information

Author: daviwil

README.md

@@ -1,5 +1,12 @@
-# added by Krishna
-"hello"
-
 # Microsoft.PowerShell.EditorTools
-Open-source library that exposes editor tools for PowerShell
+
+The Microsoft.PowerShell.EditorTools library provides common functionality
+that is needed to support a consistent and robust PowerShell development experience 
+across multiple editors.
+
+## Features
+
+- PowerShell runtime management
+- Code completion (IntelliSense)
+- Interactive development console (REPL)
+- Debugging (breakpoints, locals, etc)