[Keymap] Add masoncowen planck keymap (#14353)

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

keyboards/planck/keymaps/masoncowen/keymap.c

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+/* Copyright 2021 masoncowen
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include QMK_KEYBOARD_H
+
+
+enum planck_layers {
+  _ZWFP,
+  _NUMNAV
+};
+
+enum planck_keycodes {
+  ZWFP = SAFE_RANGE,
+  NUMNAV
+};
+
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+[_ZWFP] = LAYOUT_planck_grid(
+  KC_Z , KC_W , KC_F , KC_P , KC_Q , KC_NO , KC_NO , KC_J , KC_L , KC_U , KC_Y , OSL(_NUMNAV) ,
+  KC_A , KC_R , KC_S , KC_T , KC_G , KC_NO , KC_NO , KC_M , KC_N , KC_E , KC_I , KC_O ,
+  KC_X , KC_V , KC_C , KC_D , KC_B , KC_NO , KC_NO , KC_K , KC_H , KC_DOT , KC_COMM , KC_SCLN ,
+  KC_NO , KC_NO , KC_ESC , KC_SPC , OSM(MOD_LCTL) , KC_NO , KC_NO , KC_BSPC , OSM(MOD_LSFT) , OSM(MOD_LALT) , KC_NO , KC_NO
+),
+
+//TRANSPARENT keys are to be decided on
+[_NUMNAV] = LAYOUT_planck_grid(
+  KC_PPLS , KC_4 , KC_5 , KC_6 , KC_PAST , KC_NO , KC_NO , KC_BSLS , KC_HOME , KC_PGDN , KC_PGUP , KC_END ,
+  KC_0 , KC_1 , KC_2 , KC_3 , KC_PENT , KC_NO , KC_NO , KC_NUHS , KC_LEFT , KC_DOWN , KC_UP , KC_RIGHT ,
+  KC_PMNS , KC_7 , KC_8 , KC_9 , KC_PSLS , KC_NO , KC_NO , KC_QUOT , , _______ , _______ , _______ ,
+  KC_NO , KC_NO , _______ , _______ , _______ , KC_NO , KC_NO , _______ , _______ , _______ , KC_NO , KC_NO
+)
+
+};
+
+const key_override_t delete_key_override = ko_make_basic(MOD_MASK_SHIFT, KC_BSPC, KC_DEL);
+const key_override_t enter_key_override = ko_make_basic(MOD_MASK_SHIFT, KC_ESC, KC_ENTER);
+const key_override_t tab_key_override = ko_make_basic(MOD_MASK_SHIFT, KC_SPC, KC_TAB);
+
+const key_override_t **key_overrides = (const key_override_t *[]){
+  &delete_key_override,
+  &enter_key_override,
+  &tab_key_override,
+  NULL
+};

keyboards/planck/keymaps/masoncowen/readme.md

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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

keyboards/planck/keymaps/masoncowen/rules.mk

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+KEY_OVERRIDE_ENABLE = yes