Update README.md

Mx-Iris · web-flow · commit 27bcc5e17e42 · 2023-05-05T22:46:04.000+08:00
diff --git a/README.md b/README.md
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 # RxAppKit
 
-A description of this package.
+## Why create this
+RxCocoa provides many convenient bindings and observables for iOS, but few for macOS.
+
+The framework aims to provide rich extensions to RxSwift for macOS. The project is experimental and the API is subject to change.
+
+## Thanks
+The objc swizzle code comes from `ReactiveCocoa`
