Added R2000 DXF File.

DXF file contains hatches and closed lwpolylines for clean machining. Rumor has it this gear is symmetrical.
Font used is: Alte DIN 1451 Mittelschrift, Created in 2009 by Peter Wiegel. License: CC-BY-SA. <http://www.fontspace.com/peter-wiegel/alte-din-1451-mittelschrift>
TrueType Font converted to DXF with CNCFontFab and then manipulated with DraftSight.
Merge pull request #8 from redteam316/gh-pages

Added R2000 DXF File.