docs: Add Solend to projects.md (#470)

docs/src/getting-started/projects.md

@@ -12,3 +12,4 @@ Open a pull request to add your project to the [list](https://github.com/project
 * [Marinade Finance](https://marinade.finance/)
 * [Cryptocurrencies.Ai](https://dex.cryptocurrencies.ai/)
 * [Cyclos](https://cyclos.io/)
+* [Solend](https://solend.fi)