[Keymap] Add masoncowen planck keymap (#14353)

Co-authored-by: Drashna Jael're <drashna@live.com>

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+# ZWFP Layout Notes
+## About
+
+ZWFP is a layout largely based on Colemak Mod-DH.
+The layout rotates the QZXVB keys for the following reasons:
+* XCV are brought together.
+  * One design goal of colemak was to keep ZXCV close together as they are commonly uses control shortcuts.
+  * Mod-dh moved D to where the V key was as that position was too ergonomic for an infrequent letter like V.
+  * XCV benefit more from being together are Cut-Copy-Paste are more related than Undo (which Z commonly represents).
+* B is returned to its QWERTY position.
+  * This was an unintentional benefit.
+  * The original rotation of QZXV moved Q to a better position than B despite being was less frequent.
+    * This is based off the grid on [the colemak mod-dh page](https://colemakmods.github.io/mod-dh/model.html).
+    * This needs more testing, and may be reverted as despite the above mentioned grid, the current Q position feels easier than the current B position.
+* Based off [the layout analyser](https://colemakmods.github.io/mod-dh/analyze.html) its slightly better.
+* I like being different.
+
+## Todo
+* Work out punctuation locations.
+* Figure out what the thumb cluster is doing.
+  * I've somewhat settled on left home-row (centre) thumb key is space and right is shift OSL.
+* Maybe a deadkey instead of using shift-/alt- key overrides?
+* [Repeat key](https://www.jonashietala.se/blog/2021/09/05/t-34-0/)
+* Move Home, End, PgDn and PgUp to a kc/ko/dk with the arrow keys.
+
+### Keys still to add
+* A reset key, cba with finding small pokey things to use at the back.
+* Shifted numbers \(not including $^\*\)
+* Dedicated Pipe |
+* Dedicated Underscore \(\_\)
+* Backslash \(\\\) and shifted \(Don't forget to use NOUS\)
+* Square brackets \(\[ \]\) and shifted
+* Dedicated question mark
+* Backtick (`) and shifted
+* Function keys 1-12
+
+#### Obscure keys to add just for completeness
+* Normal Minus and Equals \(Don't know if they are needed or not \)
+* Function keys 13-24
+* Capslock \(Not sure if multi-tapping OSL actually counts as a caps lock for shift\)
+* Numlock, Scrolllock and the Locking lock keys
+* Keypad characters
+* Command Keys in general
+* International Keys
+* Right Modifiers
+* Windows keys for either side