feat: add GitHub Sponsors support with 4 tiers

- Add FUNDING.yml to enable sponsor button
- Add sponsor section to README with tier overview
- Create SPONSORS.md for sponsor recognition
- Set up 4 tiers: Believer, Builder, Growing Team, Data Infrastructure Partner

SPONSORS.md

@@ -0,0 +1,57 @@
+# 💖 Sponsors & Supporters
+
+Thank you to everyone supporting Crawl4AI! Your sponsorship helps keep this project open-source and actively maintained.
+
+## 🏢 Data Infrastructure Partners ($2000/month)
+*These organizations are building their data sovereignty with Crawl4AI at the core*
+
+<!-- Data Infrastructure Partners will be listed here -->
+*Be the first Data Infrastructure Partner! [Join us →](https://github.com/sponsors/unclecode)*
+
+---
+
+## 💼 Growing Teams ($500/month)
+*Teams scaling their data extraction with Crawl4AI*
+
+<!-- Growing Teams will be listed here -->
+*Your team could be here! [Become a sponsor →](https://github.com/sponsors/unclecode)*
+
+---
+
+## 🚀 Builders ($50/month)
+*Developers and entrepreneurs building with Crawl4AI*
+
+<!-- Builders will be listed here -->
+*Join the builders! [Start sponsoring →](https://github.com/sponsors/unclecode)*
+
+---
+
+## 🌱 Believers ($5/month)
+*The community supporting data democratization*
+
+<!-- Believers will be listed here -->
+*Thank you to all our community believers!*
+
+---
+
+## 🤝 Want to Sponsor?
+
+Crawl4AI is the #1 trending open-source web crawler. We're building the future of data extraction - where organizations own their data pipelines instead of relying on rate-limited APIs.
+
+### Available Sponsorship Tiers:
+- **🌱 Believer** ($5/mo) - Support the movement
+- **🚀 Builder** ($50/mo) - Priority support & early access
+- **💼 Growing Team** ($500/mo) - Bi-weekly syncs & optimization
+- **🏢 Data Infrastructure Partner** ($2000/mo) - Full partnership & dedicated support
+
+[View all tiers and benefits →](https://github.com/sponsors/unclecode)
+
+### Enterprise & Custom Partnerships
+
+Building data extraction at scale? Need dedicated support or infrastructure? Let's talk about a custom partnership.
+
+📧 Contact: [hello@crawl4ai.com](mailto:hello@crawl4ai.com)
+
+---
+
+*This list is updated regularly. Sponsors at $50+ tiers can submit their logos via [hello@crawl4ai.com](mailto:hello@crawl4ai.com)*