documentation: Add sponsors page

docs/sponsors.md

@@ -0,0 +1,26 @@
+---
+icon: material/hand-coin
+---
+
+# Sponsors
+
+Do you or your friends use sing-box?
+
+You can help keep the project bug-free and feature rich by sponsoring
+the project maintainer via [GitHub Sponsors](https://github.com/sponsors/nekohasekai).
+
+![](https://nekohasekai.github.io/sponsor-images/sponsors.svg)
+
+### Special Sponsors
+
+**Viral Tech, Inc.**
+
+Helping us re-list sing-box apps on the Apple Store.
+
+---
+
+[![JetBrains logo](https://resources.jetbrains.com/storage/products/company/brand/logos/jetbrains.svg)](https://www.jetbrains.com)
+
+Free license for the amazing IDEs.
+
+---

mkdocs.yml

@@ -44,6 +44,7 @@ nav:
       - Migration: migration.md
       - Deprecated: deprecated.md
       - Support: support.md
+      - Sponsors: sponsors.md
   - Installation:
       - Package Manager: installation/package-manager.md
       - Docker: installation/docker.md