Adding a Description to LED-RGB-CC-PTH

Description added:
5mm RGB LED (Common Cathode; Clear)

Acrobotic part: led-00013

http://acrobotic.com/led-00013.html

NOTE: For the board, modify your DRC Restring Pads to a min. of 6mil or
less and at 20% or less.
Merge pull request #3 from acrobotic/edit_LED-RGB-CC-PTH

Adding a Description to LED-RGB-CC-PTH