Add Container Registry deployment summary

DEPLOYMENT-SUMMARY.md

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+## GitHub Container Registry Deployment Summary
+
+### 🐳 Docker Images Published Successfully
+
+✅ **Images Published:**
+- `ghcr.io/nmemmert/spelling:1.1.0` - Version tagged image
+- `ghcr.io/nmemmert/spelling:latest` - Latest version image
+
+### 📦 Container Details
+
+| Property | Value |
+|----------|-------|
+| Base Image | Node 18 Alpine |
+| Size | ~293MB (optimized) |
+| Exposed Port | 3000/TCP |
+| User | Non-root (spelling) |
+| Entry Point | Tini init system |
+| Labels | org.opencontainers.image.source: https://github.com/nmemmert/spelling |
+
+### 📝 Documentation & Release
+
+1. **Updated README.md**
+   - Enhanced Docker container usage instructions
+   - Added specific commands for pulling and running containers
+   - Improved update and maintenance instructions
+
+2. **Git Tags & Releases**
+   - Created tag: `v1.1.1-container`
+   - Created GitHub Release: `v1.1.1 Container Release`
+
+### 🚀 Next Steps
+
+1. **Verify Package Visibility**
+   - Go to https://github.com/nmemmert/spelling/packages
+   - Ensure the package visibility is set to "Public" for easy access
+
+2. **Consider Adding Badges to README.md**
+   ```markdown
+   ![Docker Image Size](https://img.shields.io/docker/image-size/ghcr.io/nmemmert/spelling/latest)
+   ![Docker Pulls](https://img.shields.io/docker/pulls/ghcr.io/nmemmert/spelling)
+   ```
+
+3. **Setup Automated Builds (Optional)**
+   - Consider setting up GitHub Actions workflow for automated builds
+   - This would rebuild the Docker image on each push to main branch
+
+4. **Usage Testing**
+   - Test pulling and running from another system
+   - Verify all functionality works correctly in containerized version
+
+Congratulations! Your Spelling Practice App is now fully containerized and available on GitHub Container Registry.