added readme

keyboards/planck/keymaps/bone2planck/readme.md

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+check keymap.c to the layers
+
+This Layout tries to emulate the Bone2 Variant of Neo2, and is intended to be used with a German QWERTZ Softwarelayout.
+It has "üäöß" as it is optimized for a mix of German & English.
+My favourite features are the placement of the special characters often used for programming right on the home row
+and the number & navigation block combo, so you never have to move your hands from their home position.
+
+Bone2 wiki page: http://wiki.neo-layout.org/wiki/Bone