chore: added npm and lisence tags (#2)

Author: Thor963

README.md

@@ -1,4 +1,6 @@
 # expo-stallion-plugin
+[![npm Version](https://img.shields.io/npm/v/expo-stallion-plugin.svg)](https://www.npmjs.com/package/expo-stallion-plugin)  
+[![License](https://img.shields.io/npm/l/expo-stallion-plugin.svg)](https://www.npmjs.com/package/expo-stallion-plugin)
 
 Seamlessly integrate over-the-air (OTA) updates into your Expo apps with [Stallion](https://stalliontech.io/). This config plugin automatically sets up Stallion as your JavaScript bundle provider, so you can push updates to your users without going through the app stores.