Add a readme.md file for the keymap

keyboards/kc60/keymaps/mechmerlin/readme.md

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+MechMerlin's KC60 Layout
+======================
+
+This is the 60% layout used by MechMerlin. It has 3 layers, base QWERTY, FN 1, and an arrows only layer.
+
+## Keymap Notes
+- Highly influenced by the KBP V60 and WKL B.Face standard layouts
+- Does not support any form of inswitch or underglow lighting as Merlin hates them.
+- Arrow toggle switch is FN + Space
+- Rest is FN + R
+
+
+### Build
+To build this keymap, simply run `make KEYMAP=mechmerlin`.