gif and install cmd fix

Author: bradmartin

README.md

@@ -11,9 +11,13 @@ A NativeScript camera with all the bells and whistles which can be embedded insi
 ## Installation
 
 ```bash
-tns plugin add nativescript-camera-plus
+tns plugin add @nstudio/nativescript-camera-plus
 ```
 
+## Sample
+
+![Camera Plus](screens/camplus1.gif)
+
 ## Demo
 
 The demo apps work best when run on a real device.