Add Docstr

- added docstr.app

README.md

@@ -115,6 +115,8 @@ Websites with lists of relays and their performance/health:
 - [Denny](https://github.com/denostr-lab/denny)![stars](https://img.shields.io/github/stars/denostr-lab/denny.svg?style=social) - Secure, private, and decentralized group chat messaging client on Nostr
 - [Disgus](https://github.com/carlitoplatanito/disgus)![stars](https://img.shields.io/github/stars/carlitoplatanito/disgus.svg?style=social) - A comment widget like Disqus, but for Nostr.
 - [dispute](https://github.com/ethicnology/dispute)![stars](https://img.shields.io/github/stars/ethicnology/dispute.svg?style=social) - A cross-platform (Linux, Android, iOS, MacOs, Windows and Web) client for NOSTR
+- [Docstr](https://github.com/sepehr-safari/docstr) - Collaborative Documents (Google Docs Alternative)
+  - [docstr.app](https://docstr.app) - live instance
 - [earthly](https://github.com/moogmodular/earthly)![stars](https://img.shields.io/github/stars/moogmodular/earthly.svg?style=social) - A social geojson editor with maps on Nostr
 - [electron-nostr](https://github.com/wds4/electron-react-boilerplate-nostr)![stars](https://img.shields.io/github/stars/wds4/electron-react-boilerplate-nostr?style=social) - A bare-bones desktop nostr client using electron-react-boilerplate. Goal is to be an easy template for people to experiment with different ideas on decentralized ratings, reputation, and web of trust
 - [emon](https://github.com/sebastiaanwouters/emon)![stars](https://img.shields.io/github/stars/sebastiaanwouters/emon.svg?style=social) - Encrypted DMs over nostr with lightning payments integrated (WIP).