chore: add developer links to README

Author: stephanebouget

README.md

@@ -1,5 +1,7 @@
 # GitHub Security Alerts
 
+👉 **Developers**: See [DEVELOP.md](./DEVELOP.md) | [CONTRIBUTING.md](./CONTRIBUTING.md)
+
 A modern desktop application that monitors security vulnerabilities across your GitHub repositories in real-time. Built with Angular and Rust/Tauri for a lightweight, performant experience.
 
 <img width="829" height="414" alt="image" src="https://github.com/user-attachments/assets/9e17b4a1-154e-46c8-a2b8-9abe6f33d9c1" />