Add README.md for firebaseSample

Author: UnwilledTangent

firebaseSample/README.md

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+This is the Firebase Golang code. It's meant for the backend people to use this code to jumpstart their own REST API development
+
+## Getting Started
+
+First, run the development server by running `main.exe`
+
+Open [http://localhost:8080/question](http://localhost:8080/question) with your browser to see the result.
+
+Remember to place the `cs3219-g24-firebase-adminsdk-9cm7h-b1675603ab.json` file in the same directory/folder as `main.exe`
+
+DO NOT UPLOAD THE `cs3219-g24-firebase-adminsdk-9cm7h-b1675603ab.json` FILE ONTO GITHUB, OR ELSE THE FIREBASE CODE WILL STOP WORKING!!!
+