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Extended README.md with some kind of start instructions

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# ProgramChooser
A library for microPython; it can be compared to an app launcher: just launch any function by usage of two buttons
## What's this
A library for microPython; it can be compared to an app launcher: just launch any function by usage of two buttons.
It was tested on a Raspberry Pi Pico. All other microPython boards are expected to work (maybe the LCD driver (see [here](PCF8574.py)) has to be ported)
## Needed peripherals
Needed for proper work are:
- an LCD panel with a PCF8574T backpack
- two buttons
That's it. Nothing more needed.
| Component | Pin on component | Pin on Board |
| :---------------- | :--------------: | ----------------: |
| Backpack | SDA | GPIO0 |
| Backpack | SCL | GPIO1 |
| Backpack | VCC | VBUS |
| Backpack | GND | GND |
| Button 1 | 1 | GPIO2<sup>1</sup> |
| Button 1 | 2 | GND |
| Button 2 | 1 | GPIO3<sup>1</sup> |
| Button 2 | 2 | GND |
> [<sup>1</sup>]: This pin can be specified at initialization of the ProgramChooser, see the [examples](examples) folder.