[Keymap] Mac-friendly KBD 75% layouts (#11507)

* Add Aaron's KBD75 v2 for Macbook

* Add Colemak & Dvorak layers

* Update keymap to adhere to style guide and add license

* Rename README.md to readme.md

keyboards/kbdfans/kbd75/keymaps/aaronireland/readme.md

@@ -0,0 +1,39 @@
+# Aaron's KBD75v2 Mac-friendly ANSI 1u Layout
+
+This layout mimics the default KBD 75% ANSI 1u layout with a few mac-friendly tweaks. Because Mac OS uses a unique keycode
+for the Function key and only recognizes that keycode from keyboards registered with an Apple vendor ID ([see here for more info](https://beta.docs.qmk.fm/faqs/faq_keymap#fn-key-on-macos)),
+this layout uses custom macros and F-keycodes (F12, F13, etc) to provide Mac hotbar functionality (Print Screen, Launchpad, etc...) and maps the
+**Fn** key to the QMK momentary layer `_FN` (layer index 3) so it is listed as `MO(3)`.
+
+| Mac OS Keystroke | Description              | User-defined Macro | Layout Mapping   |
+| ---------------- | ------------------------ | ------------------ | ---------------- |
+| ⌘ + Shift + 3    | Print Screen             | `KC_CAPW`          | `Prt Scn`        |
+| ⌘ + Shift + 4    | Print Screen (selection) | `KC_CAPP`          | `fn` + `Prt Scn` |
+| F13              | Launchpad                |                    | `fn` + `Home`    |
+|                  | Colemak                  | `COLEMAK`          | `fn` + `C`       |
+|                  | Dvorak                   | `DVORAK`           | `fn` + `D`       |
+|                  | Qwerty                   | `QWERTY`           | `fn` + `Q`       |
+| `Ctrl` + `C`     | Quit/Break               | `KC_CTLC`          | `Pse Brk`        |
+| `Ctrl` + `B`     | vim page up              | `KC_SPU`           | `fn` + `Pg Up`   |
+| `Ctrl` + `D`     | vim page down            | `KC_SPD`           | `fn` + `Pg Dn`   |
+
+<br>
+<hr>
+
+### QWERTY - Layer 0
+
+![Layer 0: QWERTY](https://i.imgur.com/haydhHS.png)
+
+### FUNCTION - Layer 3
+
+![Layer 3: FUNCTION](https://i.imgur.com/XHUvgLd.png)
+
+<br><br><hr>
+
+### COLEMAK - Layer 1
+
+![Layer 1: COLEMAK](https://i.imgur.com/sBfHH8K.png)
+
+### DVORAK - Layer 2
+
+![Layer 2: DVORAK](https://i.imgur.com/AaypaN4.png)