02_Google Firebase文档
## Google Firebase文档
#### 1. Flutter Firebase文档
https://firebase.flutter.dev/docs/overview/
https://firebaseopensource.com/projects/firebaseextended/flutterfire/
https://github.com/FirebaseExtended/flutterfire # 可以看到具体的代码例子
<b>Flutter Firebase Firestore</b>
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#### 2. Use G-Suit/Gmail API/Cloud Function to send email to user
https://medium.com/lyfepedia/sending-emails-with-gmail-api-and-python-49474e32c81f
https://cloud.google.com/blog/products/application-development/adding-custom-intelligence-to-gmail-with-serverless-on-gcp
https://www.twilio.com/docs/verify/email