Add keywords

Author: Zemke

package.json

@@ -2,6 +2,7 @@
   "name": "react-native-peerjs",
   "version": "1.0.0",
   "description": "react-native-webrtc + peerjs",
+  "keywords": ["webrtc", "react native", "peerjs"],
   "repository": "https://github.com/Zemke/react-native-peerjs",
   "author": "Zemke <florian@zemke.io>",
   "license": "MIT",