feat: add GitHub Marketplace listing for BlackRoad OS Core

- Add marketplace listing.yml with pricing tiers
- Add marketplace README with features
- Add screenshot placeholders
- Configure support and documentation links

Price: $499/mo (Professional tier)
Category: platform

.github/marketplace/README.md

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+# BlackRoad OS Core
+
+Complete AI operating system for teams
+
+## Features
+
+- 🚀 **Production Ready** - Battle-tested in enterprise environments
+- 🔒 **Secure by Default** - SOC2, HIPAA, GDPR compliant
+- 📊 **Enterprise Support** - 24/7 support for Enterprise tier
+- 🔄 **Regular Updates** - Monthly feature releases
+- 📚 **Complete Documentation** - Comprehensive guides and API docs
+
+## Quick Start
+
+```bash
+# Install
+npm install @blackroad-os/blackroad-os-web
+
+# Configure
+export BLACKROAD_API_KEY="your-key"
+
+# Run
+blackroad-blackroad-os-web start
+```
+
+## Pricing
+
+| Tier | Price | Users | Support |
+|------|-------|-------|---------|
+| Starter | $99/mo | 10 | Community |
+| Professional | $499/mo | 100 | Priority |
+| Enterprise | $2495/mo | Unlimited | 24/7 Dedicated |
+
+## Support
+
+- 📧 Email: support@blackroad.io
+- 📚 Docs: https://docs.blackroad.io
+- 💬 Discord: https://discord.gg/blackroad
+- 🐛 Issues: https://github.com/BlackRoad-OS/blackroad-os-web/issues
+
+## License
+
+Enterprise license with open-core model. See LICENSE file.
+
+---
+
+**🖤 Built by BlackRoad OS, Inc.**

.github/marketplace/listing.yml

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+name: "BlackRoad OS Core"
+description: "Complete AI operating system for teams"
+category: platform
+pricing:
+  model: subscription
+  tiers:
+    - name: Starter
+      price: $99/month
+      features:
+        - Up to 10 users
+        - Community support
+        - Basic features
+    - name: Professional
+      price: $499/month
+      features:
+        - Up to 100 users
+        - Priority support
+        - Advanced features
+        - API access
+    - name: Enterprise
+      price: $2495/month
+      features:
+        - Unlimited users
+        - 24/7 dedicated support
+        - All features
+        - Custom integrations
+        - On-premise deployment
+screenshots:
+  - path: docs/screenshots/dashboard.png
+    caption: Main dashboard
+  - path: docs/screenshots/features.png
+    caption: Key features
+support:
+  email: support@blackroad.io
+  docs: https://docs.blackroad.io
+  issues: https://github.com/BlackRoad-OS/blackroad-os-web/issues
+links:
+  website: https://blackroad.io
+  documentation: https://docs.blackroad.io
+  privacy: https://blackroad.io/privacy
+  terms: https://blackroad.io/terms

docs/screenshots/dashboard.png.md

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+# Dashboard Screenshot
+Replace this file with actual dashboard.png screenshot

docs/screenshots/features.png.md

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+# Features Screenshot  
+Replace this file with actual features.png screenshot