Update README.md

README.md

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-# draw.io
-Source to www.draw.io
+About
+-----
+
+draw.io is an online diagramming web site that delivers the source in this project.
+
+License
+-------
+draw.io is dual licensed under either the GPL v3 or the mxGraph Commerical License, https://www.jgraph.com/Licenses/JGraph_Software_Licence.pdf. To use the commercial license, you must license from JGraph for payment, https://www.jgraph.com/purchase-mxgraph.html.