[Keyboard] Add Splitty keyboard (#11613)

keyboards/splitty/readme.md

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+# Splitty
+
+![Splitty](http://ni.fr.eu.org/~nico/qmk/splitty/splitty_for_scale.jpg)
+
+![Bottom view](http://ni.fr.eu.org/~nico/qmk/splitty/bottom_view.jpg)
+
+![Side view](http://ni.fr.eu.org/~nico/qmk/splitty/stack_view.jpg)
+
+![PCB](http://ni.fr.eu.org/~nico/qmk/splitty/splitty.png)
+
+This is a split ergonomic keyboard initially based on the Ergodox layout
+without the thumb cluster. It uses 32 keys per sides with Cherry MX
+compatibles switches, thirty 1u and two vertical 1.5u caps.
+
+The controller is integrated in order to make the keyboard as slim as possible.
+
+It connects to the computer using a micro-B USB. Both sides are connected
+together also using micro-B USB. Any connection mistake should not break
+anything and the keyboard supports hot plugging.
+
+* Keyboard Maintainer: [Nicolas Schodet](https://github.com/schodet)
+* Hardware Supported: Splitty
+* Hardware Availability: [Splitty](https://git.ni.fr.eu.org/splitty.git/about/)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make splitty:default
+
+Flashing example for this keyboard:
+
+    make splitty:default:flash
+
+Handedness should be programmed in EEPROM once, you can use these commands to
+flash the firmware and the EEPROM:
+
+    make splitty:default:dfu-split-left
+    make splitty:default:dfu-split-right
+
+If you do not have a reset keycode in your keymap, press the reset button or
+short the corresponding contacts if not populated to enter bootloader.
+
+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 our
+[Complete Newbs Guide](https://docs.qmk.fm/#/newbs).