Compare with similar libraries

Comparing the performance of Hsdlib against other libraries and implementations could make it more appealing.

Other similar libraries:
1. [Fais](https://github.com/facebookresearch/faiss)
2. [SciPy](https://scipy.org)

This Reddit post may be relevant: https://www.reddit.com/r/Python/comments/1k60ci8/hsdpy_a_python_library_for_vector_similarity_with/