Added macOS as supported platform

[AshStefanOltmann]

Running carthage update --use-xcframeworks with the Cartfile github "Countly/countly-sdk-ios" created only a frameworks for iOS, because in "Build Settings" - "Architectures" - "Supported Plattforms" only iOS was set (seemingly the default value).

Adding explicitly macosx here also adds a macOS framework for Intel and Apple Silicon to the output.

Carthage now creates a Countly.xcframework containing ios-arm64_armv7, ios-arm64_i386_x86_64-simulator and also macos-arm64_x86_64.

Unfortunately the SDKROOT must be changed to "macosx", because otherwise the building with Carthage fails for some reason.

I verified that the resulting XCFramework can be used on native macOS apps (not only Catalyst), real iOS devices and iOS simulator. These are the targets for my app.

[ArtursKadikis]

Unfortunately the SDKROOT must be changed to "macosx"

Whet repercussions would this introduce?

[ghost]

Here is the resulting XCFramework created by Carthage: Countly.xcframework.zip

[ghost]

Whet repercussions would this introduce?

I don't know if this is a problem at all. I'm not an expert here. I just can say that it works for me.