Keymap: @mattly's planck layout (#4678)

keyboards/planck/keymaps/mattly/readme.md

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+# Mattly's Planck layout
+
+This planck layout is optimized for, in order:
+
+- moving work from my pinkies to my thumbs
+- writing lisp/clojure code in my evil-mode based emacs setup
+- tapping out messages in chat applications such as slack
+- writing english in markdown files in said emacs
+- navigating mac applications
+- writing english in a web browser on a macintosh
+- writing other programming languages' code in said emacs
+- writing english in other contexts
+- literally anything else
+
+## oddities:
+
+You may notice that `enter` is on a layer. This is an experiment and I kind of
+like it so far, since many programs interpret that keystroke as a "commit"
+of some kind.
+
+## works in progress
+
+I'm trying to figure out how to make some things easier to do with the mouse or
+one-handed. Right now the combo of entering numbers and using a mouse with my
+right hand is kind of annoying. I want to be able to toggle layers on, but only
+from within that layer.
+
+![mattly's keymap](https://lyonheart.us/etc/mattly-keymap.png)