Add readme

Author: rklaehn

iroh-pkarr-naming-system/README.md

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+# IPNS, the iroh pkarr naming system
+
+This is a minimalist reimplementation of the idea of [ipfs_ipns] using the
+bittorrent mainline DHT via [pkarr].
+
+It can be used to publish an iroh blake3 content hash under an ed25519 public
+key, and to retrieve the latest content hash.
+
+[pkarr]: https://pkarr.org
+[ipfs_ipns]: https://docs.ipfs.tech/concepts/ipns/