Merge pull request #2 from IOsonoTAN/master

Add how to use it into README.md

Author: ranhsd

README.md

@@ -1,2 +1,46 @@
-# parse-server-firebase-auth-adapter
+# Parse-server-firebase-auth-adapter
 Authenticate to parse server with your Firebase account
+
+## How to use it?
+### 1) Install the module
+```js
+npm i -S parse-server-firebase-auth-adapter
+```
+### 2) Add environment variables
+* Copy the `firebaseAccountKey.json` from Firebase into your folder, maybe root of your project's folder.
+* Add new environment into your `.env` or using export in your terminal.
+```js
+// firebaseAccountKey.json store in root of project.
+FIREBASE_SERVICE_ACCOUNT_KEY = '../../firebaseAccountKey.json'
+
+// URL for connect to Firebase database.
+FIREBASE_DATABASE_URL = "https://SOME_ID.firebaseio.com"
+```
+### 3) Add this module when creating `ParseServer`
+```js
+import { ParseServer } from 'parse-server'
+import firebaseAuthAdapter from 'parse-server-firebase-auth-adapter'
+...
+const parserServer = new ParseServer({
+  ...
+  auth: {
+    firebase: firebaseAuthAdapter
+  }
+})
+```
+### 4) Using Firebase access token in our project
+* Get Parse access token by POST a raw data to `/parse/users`
+```sh
+curl -X POST \
+  {{host}}/parse/users \
+  -H 'content-type: application/json' \
+  -H 'x-parse-application-id: {{ParseAppId}}' \
+  -d '{
+    "authData": {
+    	"firebase": {
+    		"access_token": "{{access_token}}",
+    		"id": "{{FirebaseUID}}"
+    	}
+    }
+}'
+```