docs: add sponsorship information

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+# Sponsors
+
+herdr is independent, open source, and built full-time with no revenue behind it.
+Every sponsorship goes directly toward development, stability, and reaching herdr's
+goal of becoming the runtime for coding agents.
+
+→ Sponsor: https://github.com/sponsors/ogulcancelik
+→ Enterprise / partnership: hey@herdr.dev
+
+## Tiers
+
+| Tier | Amount | Recognition |
+|------|--------|-------------|
+| Backer | $25/mo | Name + link in this file |
+| Gold | $500/mo | Logo in README |
+| Platinum | $1,000/mo | Lead sponsor — logo in README and on herdr.dev |
+| Enterprise | custom | hey@herdr.dev |
+
+GitHub also allows a custom amount, so a sponsor lands in the tier their amount
+qualifies for.
+
+---
+
+## Platinum
+
+<!-- platinum sponsors render here -->
+
+## Gold
+
+<!-- gold sponsors render here -->
+
+## Backers
+
+- [Zack Drach](https://github.com/babymastodon)
+- [Alexandre Gressier](https://github.com/alexandregressier)
+- [MathiasFranceschi](https://github.com/MathiasFranceschi)
+
+## One-time supporters
+
+- [takaya-ishiyama](https://github.com/takaya-ishiyama)
+- [u-ways](https://github.com/u-ways)
+- [mtxmiller](https://github.com/mtxmiller)
+- [Sacha Wharton](https://github.com/sachajw)
+- [dsfortescue](https://github.com/dsfortescue)
+- [Hank](https://github.com/hank-warren)
+- [Adam Houston](https://github.com/ahstn)
+
+---
+
+Thank you to everyone who supports herdr. The herd keeps moving because of you. 🐑