Add minimal README and fix gitignore

.gitignore

@@ -404,6 +404,7 @@ secrets/
 # Exclude ALL documentation files - this is private development
 *.md
 !LICENSE
+!README.md
 *.html
 *.txt
 
@@ -416,6 +417,7 @@ PROXMOX_*
 HOW_TO_*
 NEXT_*
 Starting*
+README_D*
 
 # Setup and documentation files
 SETUP_*
@@ -423,4 +425,4 @@ CONTRIBUTING*
 .github/
 docs/
 
-# Only keep actual project code, no documentation
+# Only keep actual project code, no documentation

README.md

@@ -0,0 +1,45 @@
+# RedFlag
+
+**⚠️ PRIVATE DEVELOPMENT - NOT FOR PUBLIC USE**
+
+This is a private development repository for version retention only.
+
+## Status
+
+- **Active Development**: Session 4 in progress
+- **Not Production Ready**: Do not use
+- **Breaking Changes Expected**: APIs will change
+- **No Support Available**: This is not released software
+
+## What This Is
+
+A self-hosted, cross-platform update management platform built with:
+- Go server backend + PostgreSQL
+- React web dashboard with TypeScript
+- Linux agents with APT + Docker scanning
+- Local CLI tools for agent management
+
+## What This Isn't
+
+- Not ready for public use
+- Not documented for external users
+- Not supported or maintained for others
+- Not stable (active development)
+
+## For Developers
+
+This repository contains:
+- Server backend code (`aggregator-server/`)
+- Agent code (`aggregator-agent/`)
+- Web dashboard (`aggregator-web/`)
+- Database migrations and configuration
+
+**Setup**: See local documentation files (not committed to this repo).
+
+## License
+
+MIT License - see LICENSE file for details.
+
+---
+
+**This is private development software. Use at your own risk.**