Add Readme, and License.

LICENSE

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+MIT License
+
+Copyright (c) 2020 Saisha Narang, Abhishek Joshi, B.V. Raghav, Vinay P. Namboodiri
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the
+following conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
+ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# SHAD3S: A model to Sketch, Shade and Shadow #
+
+[Project Page](https://bvraghav.com/shad3s/)
+[Data](https://bvraghav.com/shad3s/data.tar.xz)
+
+Train and test commands available in
+[`train_commands`](./train_commands) and
+[`test_commands`](./test_commands) respectively.