[Keyboard] Add Hillside support (#15399)

* [Keyboard] Add Hillside

* Remove no longer used define, rename README

* Rename to readme.md

* Readme: Improve clarity, fix grammar and typos

* Readme: Remove extra line pointing to QMK docs

* Readme: Join consecutive source lines in .md

* Readme: split lines, post spelling fix

* Keymap: fix key label in readme

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+# Hillside
+
+![hillside](https://imgur.com/XW0rX13.png)
+
+[Hillside](https://github.com/mmccoyd/hillside)
+ is a split ergonomic keyboard
+ with 3x6+4+2 choc-spaced keys with aggressive column stagger,
+ a longer thumb arc and a breakoff outer-pinky column.
+
+* Keyboard Maintainer: [Michael McCoyd](https://github.com/mmccoyd)
+* Hardware Supported: ProMicro/Elite-C and compatible
+* Hardware Availability: https://github.com/mmccoyd/hillside
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/hillside/0_1:default
+
+Flashing example for this keyboard:
+
+    make handwired/hillside/0_1:default:flash
+
+## Bootloader
+
+Enter the bootloader by either:
+
+* **Physical reset button**: Briefly press the button on the front of the PCB.
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available
+
+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).