Add an inital README

README.md

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+![Cover logo](./cover.svg)
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+# Instant Distance: fast HNSW indexing
+
+[![Build status](https://github.com/InstantDomainSearch/instant-distance/workflows/CI/badge.svg)](https://github.com/djc/quinn/actions?query=workflow%3ACI)
+[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](LICENSE-MIT)
+[![License: Apache 2.0](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE-APACHE)
+
+Instance Distance is a fast pure-Rust implementation of the
+[Hierarchical Navigable Small Worlds paper][paper] by Malkov and Yashunin
+for finding approximate nearest neighbors. This implementation will power the
+[InstantDomainSearch.com][ids] backend services used for word vector indexing.
+
+[paper]: https://arxiv.org/abs/1603.09320
+[ids]: https://instantdomainsearch.com/