Add Cosmos to Non-free (#3850)

Co-authored-by: nodiscc <nodiscc@gmail.com>

non-free.md

@@ -121,6 +121,9 @@
 - [Reservo](https://reservo.co) - Scalable image hosting script with support for CDNs, paid account upgrades, advertising spots and drag & drop upload. ([Demo](https://demo.reservo.co/)) `⊘ Proprietary` `PHP`
 - [Single File PHP Gallery](http://sye.dk/sfpg/) - Web gallery in one single PHP file. `⊘ Proprietary` `PHP`
 
+### Proxy
+
+- [Cosmos](https://cosmos-cloud.io/) - Cosmos is a self-hosted platform for running server applications securely and with built-in privacy features. It acts as a secure gateway to your application, as well as a server manager. ([Source Code](https://github.com/azukaar/cosmos-Server)) `⊘ Proprietary`  `Docker/Go`
 
 ### Self-hosting Solutions