Adding new keyboard: Tenkey++ (tenkey_plusplus) (#11197)

Co-authored-by: Ryan <fauxpark@gmail.com>

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+# Tenkey++
+
+![TK++](https://i.imgur.com/DOJUgltl.jpg)
+
+Tenkey++ is a USB-C hotswap numpad with the layout of a standard 10-key. Tenkey++ also has three rotary encoders at the top for additional functionality.
+
+* Keyboard Maintainer: [Jonathon Carstens](https://github.com/jonbobcar) :: [jonathon@lizardtrick.com](mailto:jonathon@lizardtrick.com)
+* Hardware Source Files: [Tenkey++ GitHub Repository](https://github.com/jonbobcar/tenkey_plusplus)
+* Hardware Availability: [Tenkey++ on Tindie](https://www.tindie.com/products/lizardtrick/tenkey/)
+
+Make example for default layout (set up QMK build environment first):
+
+    make lizard_trick/tenkey_plusplus:default
+    
+Flashing example for this keyboard:
+    
+    make lizard_trick/tenkey_plusplus:default:flash
+    
+Default Layout:
+
+![TK++_Default](https://i.imgur.com/6L0eQJq.jpg)
+    
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with the [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+![PCB](https://i.imgur.com/aMii80bl.jpg)