[Keyboard] add shk9 macropad (#11505)

* added shk9 macropad

* updated readme

* removed json file

* updated config

* removed commented config

* fixed website address

* added bootloader mode info to readme

* remove midi enable rule

* fixed comment

* fixed default keymap

* changed layout to ortho

* fixed typo

* fixed broken layout

* pr changes

* added keymap spacing

keyboards/shk9/readme.md

@@ -0,0 +1,23 @@
+# shk9
+
+![shk9](https://i.imgur.com/FluRgiHl.jpg)
+
+The SHK9 is a tiny 3x3 macropad! Fully configurable with via.
+
+* Keyboard Maintainer: [Sam Hudson](https://github.com/samsamm777)
+* Hardware Supported: SHK9 PCB (ATmega32u4)
+* Hardware Availability: http://superhuman.website
+
+Make example for this keyboard (after setting up your build environment):
+
+    make shk9:default
+
+Flashing example for this keyboard:
+
+    make shk9:default:flash
+
+## Bootloader Mode
+
+To reset the board into bootloader mode, remove the pcb from the case buy removing keycaps, and unscrewing the 3 screws. Then (while plugged in) press the switch on the underside of the PCB for a few seconds. The board is now in bootloader mode.
+
+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).