docs: Add sosol to projects list (#947)

docs/src/getting-started/projects.md

@@ -20,3 +20,5 @@ Open a pull request to add your project to the [list](https://github.com/project
 * [Jet Protocol](https://jetprotocol.io/)
 * [Quarry](https://quarry.so/)
 * [PsyOptions](https://psyoptions.io/)
+* [sosol](https://sosol.app/)
+