feat: add under development status (#83)

Author: abdullahainun

README.md

@@ -1,5 +1,12 @@
 # TenangDB
 
+🚧 **Under Development** 
+
+This project is actively being developed. While core features are stable, expect:
+- Potential breaking changes in configuration and CLI
+- Some experimental features may not work as expected  
+- Thorough testing recommended before production use
+
 🛡️ **Backup yang Bikin Tenang** - Secure MySQL backup with intelligent automation.
 
 *Zero-configuration backup system with smart confirmations and cloud integration.*