[Keymap] add redox/rev1:fculpo keymap (#5491)

keyboards/redox/keymaps/fculpo/readme.md

@@ -0,0 +1,18 @@
+# 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.
+
+Also heavily inspired by nrichers layout.
+
+![fculpo Layout Image](https://i.imgur.com/OXT8boJ.png)
+
+## Changes to the default keymap
+
+These keymap changes are meant to improve the usability of the layout in everyday use:
+
+- Move `GUI` (`SUPER`) key to where default left `CTRL` is
+- 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)S