Add Discord link

Author: danieldk

README.md

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+[Join us on Discord](https://discord.gg/fRg8CtX6) for questions and discussions!
+
 This repo contains a Nix package that can be used to build custom machine learning kernels for PyTorch. The kernels are built using the [PyTorch C++ Frontend](https://pytorch.org/cppdocs/frontend.html) and can be loaded from the Hub with the [kernels](https://github.com/huggingface/kernels)
 Python package.