Matrix keypad case for ESPHome

I designed this keypad (case) for control of my homebrewn alarm system built with [ESP Home](https://esphome.io/) and [Home Assistant](https://www.home-assistant.io/). In addition to the 3D printed case, you will need the following electronic parts:

- 4x4 matrix keypad (e.g. [AZDelivery 4x4 Matrix Keypad](https://www.amazon.de/dp/B07D2FGQL4?ref=ppx_yo2ov_dt_b_product_details&th=1))
- NodeMCU ESP32 controller board (e.g. [AZDelivery ESP-32 Dev Kit C](https://www.amazon.de/dp/B08BTWJGFX?psc=1&ref=ppx_yo2ov_dt_b_product_details))
- 3 x LEDs, 5 mm (green, yellow, red)
- 3 x LED clip, 5 mm
- 3 x 220 Ohm resistors for LEDs
- Colored wire (red, black, etc.)
- Heat shrink tubing

Evidently you also need soldering equipment.

Adjust the resistors for the LEDs according to the brightness you require. For instance, I used a 150 Ohm resistor for the yellow LED as it was not as strong.

The ESP Home configuration file (.yaml) requires some adjustments before it will work. Firstly, wo