Update reference.md

Author: i5ting

src/reference.md

@@ -13,3 +13,4 @@
 - https://web.mit.edu/rust-lang_v1.25/arch/amd64_ubuntu1404/share/doc/rust/html/book/first-edition/functions.html
 - https://www.cs.brandeis.edu/~cs146a/rust/doc-02-21-2015/book/static-and-dynamic-dispatch.html
 - https://rust-unofficial.github.io/patterns/patterns/behavioural/strategy.html
+- https://github.com/bevyengine/bevy 游戏引擎