Force sensor test

Eerste test script met de force sensor. De sensor is erg gevoelig. Met
deze code wordt verschil gemeten tussen de bepaalde waarde.
Big update: Rotary and LCD working together

* __init__.py added for import capabilities
* Control_LCD.py added for sending text to the LCD
* main.py connects the rotary and the lcd (while True)
* mixdranken.json, added a few more cocktails
* rpi_display.py, easy function to edit the text on the LCD