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

boards/boardsource/5x12/README.md

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+# Boardsource 5x12 Ortho
+
+![Boardsource5x12](https://boardsource.imgix.net/74abb511-792e-42d9-9f6e-8100c521b2e0.jpg?raw=true)
+![Boardsource5x12LP](https://boardsource.imgix.net/57ad3f69-3c88-4ae8-9592-6e4d2f45a58e.jpg?raw=true)
+
+5x12 ortholinear -- for when just really don't want to give up your number row. The 5x12 ortholinear keyboard is a common ortholinear layout that many people prefer because it includes a number row. Made popular by Jack's Preonic from OLKB, the 5x12 ortholinear layout is a great option for those who want to try ortholinear but feel they aren't ready to make the jump to a 40%. The 5x12 Ortho is an approachable keyboard with hotswap compatibility.  
+
+kb.py is designed to work with the nice!nano  
+
+Retailers (USA)  
+5x12  
+[Boardsource](https://boardsource.xyz/store/5ecb802c86879c9a0c22db61)  
+Low Profile 5x12
+[Boardsource](https://boardsource.xyz/store/5ecb822386879c9a0c22db84)  
+
+Extentions enabled by default  
+- [Layers](https://github.com/KMKfw/kmk_firmware/tree/master/docs/layers.md) Need more keys than switches? Use layers.
+- [MediaKeys](https://github.com/KMKfw/kmk_firmware/tree/master/docs/media_keys.md) Control volume and other media functions
+
+Common Extentions
+- [Power](https://github.com/KMKfw/kmk_firmware/tree/master/docs/power.md) Powersaving features for battery life