Update ng-sample README

Author: hdeshev

ng-sample/README.md

@@ -1,11 +1,8 @@
 Getting the app to run:
 
-* npm install
-* tns platform add android
-* grunt app-full. (Make sure you set your NSDIST env var or pass modulesPath/typingsPath options)
+* `npm install`
+* `tns platform add android` | `tns platform add ios`
+* `grunt prepare` (run once to install tns-core-modules and angular2 packages)
 
 Changing and testing the app:
-* grunt app
-* ./emulateAndroid.sh <avd>
-
-Protip: Use a single command like `grunt app && ./emulateAndroid.sh`
+* `tns run android` | `tns run ios`