add working structure

Author: olegkorol

README.md

@@ -1,3 +1,44 @@
 # firebase-cloud-functions-typescript
 
-Firebase Cloud Functions with TypeScript.
+## Firebase Cloud Functions (TypeScript)
+
+### Quick start
+
+> Requirement: Node.js >= v.8
+
+```bash
+# To quickly deploy (or update existing) Firebase Functions to GCP:
+$ cd firebase-functions
+$ npm install
+# set your default project name in the firebase.json file, and then run:
+$ npm run deploy
+
+# In order to deploy single functions, you will have to install `firebase-tools` locally:
+$ npm install -g firebase-tools
+$ firebase deploy --only functions:{functionName}
+# The function names can be found in firebase-functions/src/index.ts, e.g. "firebase_firebaseFunction1"
+```
+
+The "deploy" command will run tslint, transpile into JavaScript (ES2017) under the "lib" directory, perform unit tests and deploy the transpiled code to Google Cloud Platform.
+
+**Important note: All functions using the "firebase-admin" SDK should initialize the SDK in the following manner:**
+
+```javascript
+import * as functions from 'firebase-functions';
+import * as admin from "firebase-admin";
+try {admin.initializeApp(functions.config().firebase);} catch(e) {}
+```
+
+Otherwise, the SDK might be initialized more than once - which will lead to an error on deployment.
+
+### Unit Testing
+
+The Firebase Cloud Functions use unit tests using Mocha and Chai for assertions.
+
+### Creating new functions
+
+Create a `.ts` file under `firebase-functions/src/`.
+
+After that export the function in the `index.ts` file.
+
+If you want to create any unit tests, do so in the `test` folder.