Added example google services. Added instruction for google services.

Habitica/google-services.json.example

@@ -0,0 +1,73 @@
+{
+  "project_info": {
+    "project_number": "project-number",
+    "firebase_url": "https://example.firebaseio.com",
+    "project_id": "project-id",
+    "storage_bucket": "storage.bucket"
+  },
+  "client": [
+    {
+      "client_info": {
+        "mobilesdk_app_id": "app-id",
+        "android_client_info": {
+          "package_name": "com.example"
+        }
+      },
+      "oauth_client": [
+        {
+          "client_id": "client-key",
+          "client_type": 3
+        }
+      ],
+      "api_key": [
+        {
+          "current_key": "api-key"
+        }
+      ],
+      "services": {
+        "analytics_service": {
+          "status": 1
+        },
+        "appinvite_service": {
+          "status": 1,
+          "other_platform_oauth_client": []
+        },
+        "ads_service": {
+          "status": 2
+        }
+      }
+    },
+    {
+      "client_info": {
+        "mobilesdk_app_id": "app-id",
+        "android_client_info": {
+          "package_name": "com.example"
+        }
+      },
+      "oauth_client": [
+        {
+          "client_id": "client-id",
+          "client_type": 3
+        }
+      ],
+      "api_key": [
+        {
+          "current_key": "api-key"
+        }
+      ],
+      "services": {
+        "analytics_service": {
+          "status": 1
+        },
+        "appinvite_service": {
+          "status": 1,
+          "other_platform_oauth_client": []
+        },
+        "ads_service": {
+          "status": 2
+        }
+      }
+    }
+  ],
+  "configuration_version": "1"
+}

README.md

@@ -12,7 +12,7 @@ It's also on Google Play:
        src="https://play.google.com/intl/en_us/badges/images/generic/en-play-badge.png" />
 </a>
 
-Having the application installed is a good way to be notified of new releases. However, clicking "Watch" on this 
+Having the application installed is a good way to be notified of new releases. However, clicking "Watch" on this
 repository will allow GitHub to email you whenever we publish a release.
 
 
@@ -54,6 +54,7 @@ Setup Habitica build config files by simply copying the example habitica files.
 
     $ cp habitica.properties.example habitica.properties
     $ cp habitica.resources.example habitica.resources
+    $ cp Habitica/google-services.json.example Habitica/google-services.json (Get .json from Firebase Console)
 
 Note: this is the default production `habitica.properties` file for habitica.com. If you
 want to use a local habitica server, please modify the values in the properties file accordingly.