README update for Carthage static libs

README.md

@@ -177,6 +177,18 @@ github "ReactiveX/RxSwift" ~> 5.0
 $ carthage update
 ```
 
+#### Carthage as a Static Library
+
+Carthage defaults to building RxSwift as a Dynamic Library. 
+
+If you wish to build RxSwift as a Static Library using Carthage you may use the script below to manually modify the framework type before building with Carthage:
+
+```bash
+carthage update RxSwift --platform iOS --no-build
+sed -i -e 's/MACH_O_TYPE = mh_dylib/MACH_O_TYPE = staticlib/g' Carthage/Checkouts/RxSwift/Rx.xcodeproj/project.pbxproj
+carthage build RxAlamofire --platform iOS
+```
+
 ### [Swift Package Manager](https://github.com/apple/swift-package-manager)
 
 Create a `Package.swift` file.