Docs added

boards/crkbd/README.md

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+# Corne Keyboard (CRKBD)
+
+![Crkbd](https://boardsource.imgix.net/a90342e3-caa0-467c-bebd-d17f031d5210.jpg?raw=true)
+
+![Crkbd](https://boardsource.imgix.net/9cbd31b7-3b37-42c6-919e-3be35a2578f6.jpg?raw=true)
+
+A split keyboard with a 3x6 collumnar stagger and 3 thumb keys.
+
+Keyboard Maintainer: [foostan](https://github.com/foostan/) [@foostan](https://twitter.com/foostan)  
+Hardware Availability: [PCB & Case Source](https://github.com/foostan/crkbd)  
+
+Retailers (USA)  
+Corne  
+[Boardsource](https://boardsource.xyz/store/5ecc0f81eee64242946c988f)  
+
+Corne LP  
+[Boardsource](https://boardsource.xyz/store/5f2efc462902de7151495057)  
+
+Extentions enabled by default  
+- Layers
+- RGB
+- BLE_Split
+
+Recommended Extentions
+- Split
+- Power