Add a LICENSE file

[jp-gr]

Hello,

Would it be possible to add a LICENSE file to confirm what the redistribution intention is with this repo?

https://github.com/huggingface/kernels already uses Apache 2.0 so I assume that would be an appropriate choice?

Thanks,
James

[jp-gr]

I've made a PR to add the Apache 2.0 license: #365

[danieldk]

It is not possible to add a single license to the whole repository, since each kernel is licensed differently. I've instead opened this issue:

#366

[sayakpaul]

Closing in favor of #391