Add piemod keymaps for Let's Split and Planck.

keyboards/lets_split/keymaps/piemod/README.md

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+PieMod
+======
+
+A keymap for users that need:
+
+- *P*: Programming symbols.
+
+- *I*: i3wm.
+
+- *E*: Emacs.
+
+- *M*: Macros.
+
+- *O*: Ortholinear.
+
+- *D*: Dvorak.
+
+Still a work-in-progress. Suggestions welcome @ https://github.com/dwrz/piemod.
+
+### Keymap
+
+![PieMod Keymap](./keymap.png)
+
+### TODO
+
+- [ ] Add Emacs layer.
+- [ ] Add Macro layer.
+- [ ] Add system control keys (rotation, brightness).
+- [ ] Switch " and ' quotes (or function to toggle default).
+- [ ] Add capslock.
+.