[New Shield] Murphpad (#806)

* initial commit

* initial commit

* Encode, OLED, and RGB Nice Nano support added as well as refining default keymap.

* tweaking keymap

* Prepared murphpad for PR. Includes adding support for second encoder, OLED, and underglow RGB

* Enabled OLED by default.

* removed naked60 config files

* Per PR feedback from ZMK maintainers, added hardware metadata file and renamed Pro Micro pins.

* removed tabs from keymap and replaced with normal spaces

* Update app/boards/shields/murphpad/murphpad.keymap

Co-authored-by: Nick Winans <nick@winans.codes>

* Update app/boards/shields/murphpad/murphpad.zmk.yml

Co-authored-by: Nick Winans <nick@winans.codes>

* Update app/boards/shields/murphpad/murphpad.zmk.yml

Co-authored-by: Nick Winans <nick@winans.codes>

Co-authored-by: honorless <86894501+lesshonor@users.noreply.github.com>
Co-authored-by: Nick Winans <nick@winans.codes>

app/boards/shields/murphpad/murphpad.zmk.yml

@@ -0,0 +1,12 @@
+file_format: "1"
+id: murphpad
+name: MurphPad
+type: shield
+url: https://mechwild.com/product/murphpad/
+requires: [pro_micro]
+exposes: [i2c_oled]
+features:
+  - keys
+  - display
+  - encoder
+  - underglow