Added Flask-Demo and Flask AppBuilder tutorial

fab/README.md

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+# webapp
+
+This application is built using [Flask-AppBuilder](https://github.com/dpgaspar/Flask-AppBuilder) version 5.
+
+## Files
+
+* [app.py](app.py) -- Initialize the Flask application, database session, and appbuilder object.
+* [config.py](config.py) -- Configure application settings such as the database URI, secret key, etc.
+* [models.py](models.py) -- SQLAlchemy model classes (database tables) generated by `sqlacodegen`.
+* [views.py](views.py) -- Flask-AppBuilder views that provide CRUD web interfaces for the models.
+
+## Setup
+
+Generate a random SECRET_KEY for use in config.py:
+``` sh
+python -c 'import secrets; print(secrets.token_hex())'
+```
+
+Create an admin user before running for the first time:
+``` sh
+flask fab create-admin
+```
+
+## Running
+
+Start a local dev server with debugging and reloading:
+
+``` sh
+flask run --debug
+```