doc(ls): update the readme

Author: chuckjaz

README.md

@@ -1,11 +1,18 @@
-
 # VS Code Plugin for the Angular Language Service
 
-This plugin to VS Code provides Angular langauge services for Angular template files.
+This plugin to VS Code provides Angular langauge services for Angular.
+
+This plugin will provide completions in template files and template strings.
 
 ## Limitations
 
-o This plugin assumes that all Angular templates end in the extension `.ng`.
+- The langauge service is a separate service from TypeScript and runs a duplicate
+  version of the TypeScript language service.
+
+- Only provide completions and diagnostic errors.
+
+See [#7482](https://github.com/angular/angular/issues/7482) for a more details
+status of the current progress.
 
 ## Attribution