Added cheese keymap to tada68. (#4105)

* Added cheese keymap to tada68.

* Removed extraneous definitions.

keyboards/tada68/keymaps/cheese/readme.md

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+# pgillan's Cheese TADA68 layout
+
+A collection of tweaks to make the keyboard more mac friendly and increase personal usability,
+based on the default keymap.
+
+* Turned the caps-lock into an additional function key so I didn't have to try to hit the
+  the keys on the right with one hand.
+* Moved the arrow/mouse controls to the caps-lock layer from the function layer.
+* Swapped the Windows key and Alt keys, I didn't have to do it in OS X.
+* Made the escape key work as a backtick when "Alt" is depressed, so I can 1) reverse
+  direction when I Alt-Tab through current applications, and Alt-Backtick through 
+  open windows.
+* Turned the backtick/tilde key into another backspace key, so I can just go all the way
+  up to the corner without overshooting.
+* Adjusted the volume controles so M is "mute", the "," ( or "<") is "down", and "." (or ">") 
+  is "up".  It just makes a ton more sense, I have no idea why it would have been done any
+  differently.
+* Moved PageUp/PageDown up above the delete key, and made the Home and End on the capslock
+  and function layers.
+* Made the tab key on the function layer output 4 spaces instead of a tab character.