feat(extensions): most of the extensions implementation, by kdb424

docs/handwiring.md

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+# Handwire keyboards
+This guide will not talk about the physical wiring. Check out our 
+[recommended microcontrollers](Offiially_Supported_Microcontrollers.md) and 
+follow the amazing guide for that[here](https://docs.qmk.fm/#/hand_wire). That 
+guide can be followed until you are setting up the firmware. After wiring the 
+keyboard, you can refer to our porting guide [here](porting_to_kmk.md)