Update Getting Started instructions in README

Change-Id: I41e7a57efb00064134b443992e4c185d314ad2d6

Author: kroikie

messaging/README.md

@@ -15,10 +15,9 @@ Firebase Cloud Messaging REST API in your app, see [About Cloud Messaging Server
 Getting started
 ---------------
 
-1. [Add Firebase to your Android Project](https://firebase.google.com/docs/android/setup).
-2. Create a service account as described in [Adding Firebase to your Server](https://firebase.google.com/docs/admin/setup) and download the JSON file.
+1. Create a service account as described in [Adding Firebase to your Server](https://firebase.google.com/docs/admin/setup) and download the JSON file.
   - Copy the json file to this folder and rename it to `service-account.json`.
-3. Change the `PROJECT_ID` variable in `com.google.firebase.quickstart.Messaging.java` to your project ID.
+2. Change the `PROJECT_ID` variable in `com.google.firebase.quickstart.Messaging.java` to your project ID.
 
 Run
 ---