docs: add community growth playbook

[Gingiris]

Hey 👋

I've been following Headroom — the context compression approach is exactly what the AI agent ecosystem needs right now. Most developers are paying for 70-95% boilerplate tokens without realizing it.

I put together a growth playbook that might help the project reach more users:

What's included

• Positioning — clear differentiation vs RTK and cloud APIs
• Visibility checklist — 7 awesome-lists with submission templates ready to copy-paste
• Community distribution — where Headroom users hang out (r/LocalLLaMA, r/ClaudeAI, HN) + content ideas
• Sustainable rhythm — weekly/monthly/quarterly activities that compound
• Contributor community — good-first-issue ideas and recognition
• Success metrics — trackable goals for the next 6 months

Why these specific tactics?

I've helped open source projects go from 0 → 30k+ stars. The pattern that works:

1. Get listed in awesome-lists (passive discovery)
2. Show up where users complain about the problem you solve (Reddit, HN)
3. Make it easy for contributors to help (good-first-issue tags)

Feel free to

• Merge as-is
• Edit/remove sections that don't fit
• Close if this isn't useful

No pressure — just a community contribution. Happy to help if you have questions.

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P.S. If you're interested in open source growth tactics, I maintain some playbooks at github.com/Gingiris that you might find useful.