docs: Add Arrow Protocol to projects.md
@@ -21,4 +21,5 @@ Open a pull request to add your project to the [list](https://github.com/project
* [Quarry](https://quarry.so/)
* [PsyOptions](https://psyoptions.io/)
* [sosol](https://sosol.app/)
+* [Arrow Protocol](https://arrowprotocol.com/)
