chore: add .github/FUNDING.yml — enables Sponsor button on GitHub mirror

Sloba 2026-05-06T17:30Z chat: "i want to copy this public repo to my
github and make it a clone there as a public github repo with
sponsorship enabled".

GitHub mirror created at https://github.com/slobodanmargetic988/weeyuga-benchmarks-public
(public, with description + homepage pointing at
https://benchmarks.weeyuga.com); both `main` and the
`feature/runner-and-agent-instructions` branch pushed.

This commit lights up the "Sponsor" button on the GitHub repo's
landing page via .github/FUNDING.yml. The button currently routes to
github.com/sponsors/slobodanmargetic988 — Sloba's GitHub Sponsors
profile needs separate one-time enrollment at that URL before the
button does anything useful (see GitHub's "Set up GitHub Sponsors"
flow). Once enrolled, every public repo of his with this FUNDING.yml
gets a Sponsor button automatically.

The file also leaves placeholders for `custom`, `patreon`, `ko_fi`,
`tidelift`, `liberapay`, `polar` etc., commented out — uncomment +
edit when corresponding accounts exist.

Lives in `.github/FUNDING.yml` (the canonical GitHub-side path);
Gitea ignores the file harmlessly since it has no equivalent
sponsorship integration today, so the file is identical on both
mirrors with no Gitea-side noise.

.github/FUNDING.yml

@@ -0,0 +1,23 @@
+# Enables the "Sponsor" button on the GitHub repo page.
+#
+# `github` lights up the GitHub Sponsors button — requires Sloba's
+# GitHub Sponsors profile to be active at https://github.com/sponsors/slobodanmargetic988
+# (one-time enrollment, separate from this repo).
+#
+# `custom` lets you point at any external sponsorship URL too — e.g. a
+# Stripe Checkout, Buy Me A Coffee, or a Weeyuga-hosted donations page.
+# Add or remove platforms as you go; YAML keys are case-sensitive.
+
+github: [slobodanmargetic988]
+
+# When you have an active sponsorship URL elsewhere, uncomment + edit:
+# custom: ["https://weeyuga.com/sponsor"]
+
+# Other supported platforms (add as needed; comment with key=value):
+# patreon: <username>
+# open_collective: <project>
+# ko_fi: <username>
+# tidelift: <platform>/<package>
+# liberapay: <username>
+# issuehunt: <username>
+# polar: <username>