Create kmk_vs_circuitpython.md

Move KMK vs CircuitPython from main guide to dedicated page

docs/kmk_vs_circuitpython.md

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+## Firmware of choice
+### KMKPython
+KMKPython is a fork of Circuitpython, but with libraries for most extensions 
+built in. This saves you from having to get them all and keep them updated 
+yourself. There may be other features added in the future that are exclusive to 
+KMKPython. For the nice!nano, this is highly recommended, and used in place of 
+Circuitpython.  
+Notable differences include
+- Built in libraries for bluetooth, RGB, and more
+- Saves space as builds are optimized for keyboards
+- Microcontrollers like the nice!nano will be able to access all features out of
+the box.
+
+### Circuitpython
+Circuitpython can be installed by following this guide using the guide 
+[here](https://learn.adafruit.com/welcome-to-circuitpython/installing-circuitpython). 
+It's recommended to run the latest stable version that is at least 5.0 or higher.
+Beta versions may work, but expect limited support.
+#### Notable differences include
+ - Supports more devices
+ - Less built in libraries. If using RGB, bluetooth, and more, you will have to 
+ add these libraries yourself
+ - Some devices such as the nice!nano don't have much free space, so not all 
+ features can be installed at the same time