migrated Roadmap to wiki

Roadmap.md

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-# Roadmap
-
-## Coming features
-
-- measurement of height using pressure data
-- height data in diagram
-- measurement of steps using sensor data
-
-## Planned features
-
-- upload workouts as GPX to dropbox
-- upload workouts as GPS trace to OpenStreetMap
-- voice feedback e.g. speaking every 10-30 minutes the general data
-- support fitnessbands
-
-## Considered features
-
-- running "against" other workouts
-- offline maps
-- something like a comparision to your friends