add flask-12-deploy

Author: xugaoxiang

Flask-12-deployment/README.md

@@ -9,4 +9,5 @@
 8. [重定向](https://xugaoxiang.com/2020/03/23/flask-8-redirect/)
 9. [闪现消息](https://xugaoxiang.com/2020/03/25/flask-9-flash/)
 10. [表单处理](https://xugaoxiang.com/2020/07/09/flask-10-wtf/)
-11. [数据库操作flask-sqlalchemy](https://xugaoxiang.com/2020/07/14/flask-11-sqlalchemy/)
+11. [数据库操作flask-sqlalchemy](https://xugaoxiang.com/2020/07/14/flask-11-sqlalchemy/)
+12. [项目部署](https://xugaoxiang.com/2020/07/21/flask-12-deployment/)