Update readme

Author: nicolelim02

backend/user-service/README.md

@@ -8,7 +8,29 @@
 
 2. To connect to your cloud MongoDB instead of your local MongoDB, set the `NODE_ENV` to `production` instead of `development`.
 
-3. Update `MONGO_CLOUD_URI`, `MONGO_LOCAL_URI`, `FIREBASE_PROJECT_ID`, `FIREBASE_PRIVATE_KEY`, `FIREBASE_CLIENT_EMAIL`, `FIREBASE_STORAGE_BUCKET`, `JWT_SECRET`.
+3. Update the following variables in the `.env` file:
+
+   - `MONGO_CLOUD_URI`
+
+   - `MONGO_LOCAL_URI`
+
+   - `FIREBASE_PROJECT_ID`
+
+   - `FIREBASE_PRIVATE_KEY`
+
+   - `FIREBASE_CLIENT_EMAIL`
+
+   - `FIREBASE_STORAGE_BUCKET`
+
+   - `JWT_SECRET`
+
+   - `SERVICE`: Email service to use to send account verification links, e.g. `gmail`.
+
+   - `USER`: Email address that you will be using, e.g. `[email protected]`.
+
+   - `PASS`: The app password. For gmail accounts, please refer to this [link](https://support.google.com/accounts/answer/185833?hl=en).
+
+   - `REDIS_URI`
 
 4. A default admin account (`email: [email protected]` and `password: Admin@123`) wil be created. If you wish to change the default credentials, update them in `.env`. Alternatively, you can also edit your credentials and user profile after you have created the default account.