DB examples

[Isaac-Flath]

Lots of Qs and interest in DBs. Make examples with SQLite and Postgres.

Jeremy said "My suggestion would be to use examples/user_app.py, but remove the auth, and add SortableJS"

[Isaac-Flath]

• [x] Beginner Todo (Sqlite minimal example)
• [ ] SqlAlchemy Minimal Example
• [ ] Intermediate Todo APP
• [ ] Advanced Todo App