Add ffxiv-best-craft to ecosystem.md

ECOSYSTEM.md

@@ -28,6 +28,7 @@ If your project isn't listed here and you would like it to be, please feel free
 - [palpo](https://github.com/palpo-matrix-server/palpo): A Rust Matrix Server Implementation.
 - [yiirs](https://github.com/shenghui0779/yiirs): Rust API 快速开发脚手架 (Salvo & Axum).
 - [luxy](https://github.com/alley-rs/fluxy): Software for fast file transfer between terminals in the same network segment.
+- [ffxiv-best-craft](https://github.com/Tnze/ffxiv-best-craft): A crafting simulator and solver for FF14 with friendly GUI.
 
 ## Tutorials
 - [Rust Salvo零基础教程](https://www.bilibili.com/video/BV1FS421N71D/): Rust Salvo零基础入门教程.