Create 0xdec Preonic keymap

An ergonomically optimized Colemak keymap for the grid-layout Preonic

keyboards/preonic/keymaps/0xdec/README.md

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+Ergonomic Colemak Keymap
+========================
+An ergonomically optimized Colemak keymap for the grid-layout Preonic
+
+Modes
+----------
+
+#### Colemak
+
+> Base layer
+
+- All alphanumerics and symbols available on the base layer
+
+----------
+
+#### Game
+
+> QWERTY layout for use with games or number entry
+
+- Standard QWERTY layout
+- Integrated right-hand numpad in phone layout
+
+----------
+
+#### Function (Raise)
+
+> Functions and mode switching
+
+- Turns NEIO into arrow cluster, with nav cluster below (Home, Page Down, Page Up, End)
+- Reset key at lower left (Esc)