Add todo-list.

TODO.md

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+TODO
+====
+
+Fixes and ideas for the future
+
+## Per user scotch
+
+Different users have a different commit style & frequency.
+We should be able to define a per-user scotch.
+
+
+## Automatic scotch : Use median time between consecutive commits, per user
+
+	def median(array)
+  	  sorted = array.sort
+  	  len = sorted.length
+  	  return (sorted[(len - 1) / 2] + sorted[len / 2]) / 2.0
+	end
+