[admob] update package.json meta data

packages/admob/package.json

@@ -2,7 +2,7 @@
   "name": "@react-native-firebase/admob",
   "version": "0.4.0",
   "author": "Invertase <oss@invertase.io> (http://invertase.io)",
-  "description": "React Native Firebase - Admob",
+  "description": "React Native Firebase - Google AdMob is an easy way to monetize mobile apps with targeted, in-app advertising.",
   "main": "lib/index.js",
   "types": "lib/index.d.ts",
   "scripts": {
@@ -19,7 +19,12 @@
     "react",
     "react-native",
     "firebase",
-    "admob"
+    "admob",
+    "gdpr",
+    "banner ad",
+    "rewarded ad",
+    "interstitial",
+    "ad consent"
   ],
   "peerDependencies": {
     "@react-native-firebase/app": "*"