Added BACKERS.md

BACKERS.md

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+# Bambuddy Backers & Sponsors
+
+Bambuddy is sustainable thanks to people who put their money where their use is. This page lists everyone who supports the project on [GitHub Sponsors](https://github.com/sponsors/maziggy) or [Ko-fi](https://ko-fi.com/maziggy).
+
+If you'd like to support Bambuddy:
+
+- **GitHub Sponsors** (recurring, 5 tiers from $5/mo to $500/mo) — https://github.com/sponsors/maziggy
+- **Ko-fi** (one-time or recurring) — https://ko-fi.com/maziggy
+
+If you sponsor and your name isn't here within 48h, please write an email to martin@bambuddy.cool, ping `maziggy` on Discord or open an Issue.
+
+---
+
+## Corporate Sponsors ($500/mo+)
+
+*None yet — be the first. Your logo on the bambuddy.cool homepage and press.html, plus co-marketing.*
+
+## Sustaining Sponsors ($150/mo+)
+
+*None yet.*
+
+## Patrons ($35/mo+)
+
+*None yet.*
+
+## Supporters ($15/mo+)
+
+*None yet.*
+
+## Backers ($5/mo+)
+
+*None yet.*
+
+---
+
+## One-time and historical supporters
+
+A general thank-you to everyone who's contributed via Ko-fi over the past months. Specific names get added on request — if you'd like to be listed, ping `maziggy`.
+
+---
+
+Thanks. — Martin