Add library name

This PR ensures people know the library name.

We could also add a "Use in CrossFormer" button similar to "Use in Transformers". Requires a PR like this: https://github.com/huggingface/huggingface.js/pull/842

Cheers,
Niels from HF

README.md

@@ -1,6 +1,7 @@
 ---
 license: mit
 pipeline_tag: robotics
+library_name: crossformer
 ---
 # CrossFormer