Add icon for Bodhi Timer

[tzugen]

This is what Turtl put out:

<!-- Bodhi Timer -->
<item component="ComponentInfo{org.yuttadhammo.BodhiTimer/org.yuttadhammo.BodhiTimer.TimerActivity}" drawable="bodhitimer"/>

[dkanada]

This icon doesn't quite look simple enough to match the rest of the pack, or maybe you used SVG conversion software to generate the icon? That might explain the shaky lines.

[aloxe]

@dkanada This is the way the original icon looks so I think the shaky lines are quite intentional here. Tough @tzugen If you could add the main veins of the leave that may look nicer.