[pr2_description] Move Drake files into here

This were copied from Drake as of 665721e9, notably copying the
stl2obj output obj files, not the original stl files.

The only changes to the URDF are to the URL paths.

pr2_description/LICENSE

@@ -0,0 +1 @@
+WIP We're not sure yet. Need to fix before merging this PR.

pr2_description/README.md

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+This directory contains a drake-compatible description of the PR2. See the
+comment at the top of the urdf for an inventory of changes from the original
+model.

pr2_description/meshes/base_v0/base_L.obj

@@ -0,0 +1,147 @@
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