Update README.md

README.md

@@ -42,6 +42,7 @@ of the public instances.
 - [Bucket](https://github.com/coracle-social/bucket)![stars](https://img.shields.io/github/stars/coracle-social/bucket.svg?style=social) - in-memory-only nodejs relay for testing/hacking on. Stupid simple, <100 LOC.
 - [cagliostr](https://github.com/mattn/cagliostr)![stars](https://img.shields.io/github/stars/mattn/cagliostr.svg?style=social) - Faster Nostr relay in C++ backend by sqlite3.
 - [Denostr](https://github.com/guakamoli/denostr)![stars](https://img.shields.io/github/stars/guakamoli/denostr.svg?style=social) - Deno based, cloud native nostr implemention.
+- [Ditto](https://github.com/soapbox-pub/ditto)![stars](https://img.shields.io/github/stars/soapbox-pub/ditto.svg?style=social) - Mastadon server and Nostr relay in one
 - [Ephemerelay](https://gitlab.com/soapbox-pub/ephemerelay)![stars](https://img.shields.io/gitlab/stars/soapbox-pub/ephemerelay.svg?style=social) - An in-memory Nostr relay that doesn't store data.
 - [gnost-relay](https://github.com/barkyq/gnost-relay) ![stars](https://img.shields.io/github/stars/barkyq/gnost-relay.svg?style=social) - nostr relay written in go backed by postgresql database.
 - [knostr](https://github.com/lpicanco/knostr)![stars](https://img.shields.io/github/stars/lpicanco/knostr.svg?style=social) - a nostr relay implemented in Kotlin with support for Postgres and metrics(micrometer).