Move a list of repositories from Community website page.

CONTRIBUTING.md

@@ -40,6 +40,21 @@ For those who want to contribute to the Redox GUI, our GUI strategy has recently
  * OrbTk is now sunsetting, and its developers have moved to other projects such as the ones below. There is currently no Redox-specific GUI development underway.
  * Redox is in the process of adopting other Rust-lang GUIs such as [Iced](https://iced.rs) and [Slint](https://slint-ui.com/). Please check out those projects if this is your area of interest.
 
+You can contribute to Redox documentation/code on these repositories:
+
+(The order is based on difficulty, easy things first)
+
+- [Website](https://gitlab.redox-os.org/redox-os/website)
+- [Book](https://gitlab.redox-os.org/redox-os/book)
+- [Main Repository (build system/config)](https://gitlab.redox-os.org/redox-os/redox)
+- [Cookbook (all system components/ported software)](https://gitlab.redox-os.org/redox-os/cookbook)
+- [Display Server/Desktop Environment](https://gitlab.redox-os.org/redox-os/orbital)
+- [Orbital Client Library](https://gitlab.redox-os.org/redox-os/orbclient)
+- [Orbital Applications](https://gitlab.redox-os.org/redox-os/orbutils)
+- [Redox C Library](https://gitlab.redox-os.org/redox-os/relibc)
+- [Drivers](https://gitlab.redox-os.org/redox-os/drivers)
+- [Kernel](https://gitlab.redox-os.org/redox-os/kernel)
+
 ## Best Practices and Guidelines
 
 - [Redox Book Guide](https://doc.redox-os.org/book/ch11-00-best-practices.html)