Add Swift section with swift-sdk link (#438)

Author: saltukalakus

docs/libraries/community.mdx

@@ -18,3 +18,7 @@ description: "Community managed libraries for the Agent Client Protocol"
 ## React
 
 - [use-acp](https://github.com/marimo-team/use-acp)
+
+## Swift
+
+- [swift-sdk](https://github.com/aptove/swift-sdk)