docs: add open source philosophy and support options to README

- Add "100% free and open source" tagline at top
- Update YouTube line with upcoming master class/podcast
- Add "Help us grow" CTA for stars and subs
- Add new "Support BMad" section with donation and speaking info

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

@@ -7,6 +7,8 @@
 
 **Build More, Architect Dreams** — An AI-driven agile development framework with 21 specialized agents, 50+ guided workflows, and scale-adaptive intelligence that adjusts from bug fixes to enterprise systems.
 
+**100% free and open source.** No paywalls. No gated content. We believe knowledge should be shared, not sold.
+
 ## Why BMad?
 
 Traditional AI tools do the thinking for you, producing average results. BMad agents act as expert collaborators who guide you through structured workflows to bring out your best thinking.
@@ -60,10 +62,20 @@ This analyzes your project and recommends a track:
 ## Community
 
 - [Discord](https://discord.gg/gk8jAdXWmj) — Get help, share ideas, collaborate
-- [YouTube](https://www.youtube.com/@BMadCode) — Video tutorials and updates
+- [YouTube](https://www.youtube.com/@BMadCode) — Tutorials, master class, and podcast (launching Feb 2025)
 - [GitHub Issues](https://github.com/bmad-code-org/BMAD-METHOD/issues) — Bug reports and feature requests
 - [Discussions](https://github.com/bmad-code-org/BMAD-METHOD/discussions) — Community conversations
 
+**Help us grow:** Star us on [GitHub](https://github.com/bmad-code-org/BMAD-METHOD/) and subscribe on [YouTube](https://www.youtube.com/@BMadCode) — every star and sub helps us reach more developers!
+
+## Support BMad
+
+BMad is free for everyone. If you'd like to support development:
+
+- [Buy Me a Coffee](https://buymeacoffee.com/bmad)
+- Corporate sponsorship — DM on Discord
+- Speaking & media inquiries — Reach out on Discord (conferences, podcasts, interviews)
+
 ## Contributing
 
 We welcome contributions! See [CONTRIBUTING.md](CONTRIBUTING.md) for guidelines.