docs(README.md): add special thanks (#184)

Author: risu729

README.md

@@ -238,3 +238,9 @@ This package is released automatically by GitHub Actions using [semantic-release
 ## 📜 License
 
 MIT License
+
+## 💖 Special Thanks
+
+- [Astro](https://astro.build) team and community for the project and the powerful Image Service API.
+- [sharp](https://sharp.pixelplumbing.com/) and [svgo](https://svgo.dev/) contributors for the awesome image processing libraries.
+- [Playform](https://github.com/PlayForm) for the inspiration from the [`@playform/compress`](https://github.com/PlayForm/Compress) package.