chore: add FUNDING.yml (GitHub Sponsors button)

Author: muhammetsafak

.github/FUNDING.yml

@@ -0,0 +1,5 @@
+# Funding configuration for this repository.
+# Displays a "Sponsor" button on this repo's GitHub page.
+# See: https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/displaying-a-sponsor-button-in-your-repository
+
+github: [muhammetsafak]