[Keymap] Add a tweaked Redox keymap (#5422)

* Add nrichers keymap

* Additional keymap tweaks, add readme info

* Improve descriptions for changes from default keymap

* Add image of keymap, update .gitignore to

* Add image link

Adds an image of the modified keymap.

* Improve legibility of keymap changes with colour coding

* Tinker with color codes in Markdown

* Experiment with colour codes

* Tinker more with colour codes

* Figured out the easiest way to include colour coding

* Undo earlier .gitignore change

1 files changed, 28 insertions, 0 deletions

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+# A tweaked keymap for Redox
+
+This keymap modifies the [default keymap](https://github.com/qmk/qmk_firmware/tree/master/keyboards/redox) for the awesome [Redox keyboard](https://github.com/mattdibi/redox-keyboard) designed by Mattia Dal Ben.
+
+![Modified Redox keymap](https://github.com/nrichers/qmk_firmware/blob/master/keyboards/redox/keymaps/nrichers/keymap.png)
+
+## Changes to the default keymap ![#99fcbe](https://placehold.it/15/99fcbe/000000?text=+)
+
+These keymap changes are meant to improve the usability of the layout in everyday use:
+
+- Move `GUI` (`SUPER`) key to where default left `CTRL` and right `ALT` are - gives you two frequently used `CMD` keys on macOS where my brain expects them
+- Move `/?` into usual location next to right `SHIFT` - the default flash from Falbatech put `\|` here (might not be the Redox default?), which felt unintuitive
+- Put `\|` into bottom-left spot where `GUI` (`SUPER`) was - had to go somewhere and this bottom-left placement sort of balances with the almost bottom-right `/?`
+- Change default `ESC` into `ESC` on tap, `CTRL` on hold - Love the UNIX-ey `CTRL` key location and wanted to keep `ESC` in the original position
+- Change default `'` above right `SHIFT` into `'` on tap, `CTRL` on hold - Love the UNIX-ey CTRL key location, but it can give you 'left claw hand', which a second, mirrored `CTRL` key fixes
+- Add `F11` and `F12` keys to two layers - needed on macOS if you want to control volume up and down from your keyboard (not shown, on a different layer)
+- On thumb clusters: 
+  - Left: Move `SPACE` closest to left thumb and move `BACKSPACE` to the right of that - put the key for 'getting it right' closest to your thumb and reduce usage of my right hand (purely personal preference)
+  - Right: Move `ENTER` closest to right thumb and move `DEL` to the left of that - put the key for 'getting it right' closest to your thumb
+
+## Changes to the Redox layout ![#99e6fc](https://placehold.it/15/99e6fc/000000?text=+)
+
+These are physical keycap changes on the board that make reaching the `Layer 1` keys easier and that, subjectively, look more balanced visually:
+
+- Increase the `Layer 1` key sizes from 1U to 1.25U
+- Decrease the 1.5 U key size for `[` and `]` to 1.25U
+
+You could even make `[` and `]` 1U so that you can use keycaps from a standard ANSI key set and also increase the size of the `Layer 2` keys to 1.5U.