Keymap: Adding readme file to personal keymap folder (#3665)

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* added readme

keyboards/iris/keymaps/bmoorey/readme.md

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+This is (what I consider to be) an improvement over the default Iris keymap.
+It includes a QWERTY layer, a general system layer with arrows, volume control
+and a numpad on the right board; a second raised layer with function keys and
+more extensive media controls; and an adjust layer with controls for RGB
+underlighting.