add GFX Pack examples readme

micropython/examples/gfx_pack/README.md

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+# Pico GFX Pack MicroPython Examples <!-- omit in toc -->
+ 
+- [About Pico GFX Pack](#about-pico-gfx-pack)
+- [Pico GFX Pack and PicoGraphics](#pico-gfx-pack-and-picographics)
+- [Basic Examples](#basic-examples)
+  - [Balls Demo](#balls-demo)
+  - [Button Test](#button-test)
+  - [Rainbow](#rainbow)
+  - [Snake](#snake)
+- [Advanced Examples](#advanced-examples)
+  - [CO2](#co2)
+  - [Thermometer](#thermometer)
+
+## About Pico GFX Pack
+
+GFX Pack adds a 128x64 LCD Matrix display to your headered Raspberry Pi Pico or PicoW, with RGBW backlight and 5 input buttons for all your display and control needs.
+
+- :link: [Pico GFX Pack store page](https://shop.pimoroni.com/products/pico-gfx-pack)
+
+You'll need to download the most recent version of our MicroPython firmware for your board from the link below.
+
+- [MicroPython releases](https://github.com/pimoroni/pimoroni-pico/releases)
+- [Installing MicroPython](../../../setting-up-micropython.md)
+
+## Pico GFX Pack and PicoGraphics
+
+The easiest way to start displaying cool stuff on GFX Pack is using our GFX Pack helper module (which contains a bunch of useful shortcuts for interacting with the board) and our PicoGraphics display library which handles drawing things on the screen.
+
+- [GFX Pack function reference](../../modules_py/gfx_pack.md)
+- [PicoGraphics function reference](../../modules/picographics/README.md)
+
+## Basic Examples
+
+### Balls Demo
+
+[balls_demo.py](balls_demo.py)
+
+LCD demo with a bunch of bouncy balls!
+
+### Button Test
+
+[button_test.py](button_test.py)
+
+Shows how to read the buttons, display text and change the colour of the RGBW backlight.
+
+### Rainbow
+
+[rainbow.py](rainbow.py)
+
+This example borrows a CircuitPython hsv to rgb function to cycle through some rainbows on GFX Pack's screen.
+
+### Snake
+
+[snake.py](snake.py)
+
+Basic Snake demo for GFX Pack.
+
+- A = up
+- B = down
+- C = reset
+- D = left
+- E = right
+
+## Advanced Examples
+
+These examples require additional hardware. We connected our breakouts using a JST-SH to JST-SH cable:
+
+- :link: [Qw/ST cable store page](https://shop.pimoroni.com/products/jst-sh-cable-qwiic-stemma-qt-compatible?variant=31910609846355)
+
+### CO2
+
+[co2](co2.py)
+
+Add a SCD41 sensor breakout to your GFX Pack to make a handy CO2 detector!
+Press A to reset the high/low values.
+
+- :link: [SCD41 breakout store page](https://shop.pimoroni.com/products/scd41-co2-sensor-breakout)
+
+### Thermometer
+
+[thermometer.py](thermometer.py)
+
+This demo uses a BME680 or BME688 breakout to measure temperature, pressure, and humidity and display it on the GFX display. 
+
+To use the Pico's internal temperature sensor in place of the BME68x breakout, just change `use_bme68x_breakout` to `False`.
+
+- :link: [BME680 breakout store page](https://shop.pimoroni.com/products/bme680-breakout)
+- :link: [BME688 breakout store page](https://shop.pimoroni.com/products/bme688-breakout)