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

boards/reviung41/README.md

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+# Reviung41
+
+![Reviung41](https://boardsource.imgix.net/ea77f3f8-6cc4-4cb4-a801-cf58b5af8fcc.jpg?raw=true)
+
+The Reviung41 is a 41 key keyboard designed by gtips, it is a slightly larger version of the popular Reviung 39. These "split non-split" keyboards offer a lot of features split keyboards have in terms of comfort and ergonomics but do so in a single-piece package. Many people consider keyboards in this style easier to travel with since you don't have to manage two halves and there is of course no need for a TRRS cable. This board sits somewhere between and Atreus and Corne, and it is extremely comfortable to use.
+
+kb.py is designed to work with the nice!nano
+
+Hardware Availability: [PCB & Case Data](https://github.com/gtips/reviung/tree/master/reviung41)
+
+Retailers (USA)  
+[Boardsource](https://boardsource.xyz/store/5f2ef1b52bf5e8714a60f613)  
+
+Extentions enabled by default  
+- [Layers](https://github.com/KMKfw/kmk_firmware/tree/master/docs/layers.md) Need more keys than switches? Use layers.
+- [RGB](https://github.com/KMKfw/kmk_firmware/tree/master/docs/rgb.md) Light it up
+- [ModTap](https://github.com/KMKfw/kmk_firmware/tree/master/docs/modtap.md) Allows mod keys to act as different keys when tapped.
+
+Common Extentions
+- [Power](https://github.com/KMKfw/kmk_firmware/tree/master/docs/power.md) Powersaving features for battery life