[1] Refine; [2] Added README

README.md

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+# flask-example
+
+A minimal web app developed in [Flask](http://flask.pocoo.org/). 
+
+The main purpose is to introduce how to implement the essential elements in web application with Flask framework, including
+
+- URL Building
+
+- Authentication with Sessions
+
+- Template & Template Inheritance
+
+- Error Handling
+
+- Integrating with *Bootstrap*
+
+- Interaction with Database (SQLite)
+
+For more basic knowledge of Flask, you can refer to [a tutorial on Tutorialspoint](https://www.tutorialspoint.com/flask/).
+
+
+## Details
+
+There are three tabs in this toy app
+
+- **Public**: this is a page which can be accessed by anyone, no matter if the user has logged in or not.
+
+- **Private**: Only logged-in user can access this page. Otherwise the user will get a 401 error page.
+
+- **Admin Page**: This part is only open to the user who logged in as "Admin". In this tab, the administrator can manage accounts (list, delete, or add).
+
+
+A few accounts were set for testing, like ***admin*** (password: admin), ***test_1*** (password: 123456), etc. You can also delete or add accounts after you log in as ***admin***.
+
+
+## References
+
+- http://flask.pocoo.org/
+
+- https://www.tutorialspoint.com/flask/
+
+
+
+## Credict
+Image private.jpg: https://commons.wikimedia.org/wiki/File:(315-365)_Locked_(6149414678).jpg
+
+Image public.jpg: https://commons.wikimedia.org/wiki/File:Drown%3F!_(131380682).jpg