New Flask documentation

docs/rpi-documentation/Flask.md

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+# Flask
+
+
+## Introduction
+Flask is a micro web framework written in Python. It is easy to use and has a lot of documentation. We are going to use Flask to serve our REST api.
+
+## Cheatsheet
+```python
+print(f"Hello world have a nice {args}!")
+```
+This way you can put variables in a string. This is called f-strings.
+
+
+
+## Rules for python
+* You can only use one return statement in a function.