docs: add GH button in support of Ukraine

## Summary Our mission at Meta Open Source is to empower communities through open source, and we believe that it means building a welcoming and safe environment for all. As a part of this work, we are adding this banner in support for Ukraine during this crisis.
emepetres · Mar 4, 2022 · 0bf2476 · 0bf2476
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 # Submanifold Sparse Convolutional Networks
 
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 This is the PyTorch library for training Submanifold Sparse Convolutional Networks.
 
 ## Spatial sparsity