[README.md] add document to convert from stl to urdf, eus.#187

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k-okada merged 1 commit intojsk-ros-pkg:masterfrom mmurooka:add-doc-for-stl-convert

Oct 24, 2016

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Commits on Oct 20, 2016

[README.md] add document to convert from stl to urdf, eus.
mmurooka
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