Add branching strategy documentation

- Create BRANCHING_STRATEGY.md with Git Flow workflow
- Update README.md with branching overview
- Document dev → staging → main flow
- Include PR guidelines and best practices
- Add emergency procedures and rollback instructions

README.md

@@ -363,6 +363,34 @@ If a deployment fails but the name is marked as taken:
 
 See `CLAUDE.md` for development guidelines and architecture documentation.
 
+## Branching Strategy
+
+This project uses a Git Flow branching model:
+
+- **`main`** - Production branch (deployed to https://portal.ai.flexinit.nl)
+- **`staging`** - Pre-production testing environment
+- **`dev`** - Active development branch
+
+### Workflow
+```
+feature/xyz → dev → staging → main
+```
+
+### Quick Commands
+```bash
+# Start new feature
+git checkout dev
+git checkout -b feature/my-feature
+
+# Deploy to staging (via PR)
+# Create PR: dev → staging
+
+# Deploy to production (via PR)
+# Create PR: staging → main
+```
+
+See `BRANCHING_STRATEGY.md` for complete workflow documentation.
+
 ## License
 
 [Your License Here]