SPM support

[raulriera]

Feature

It would be preferable to use Swift Package Manager over all the options disclosed in the readme file

[raulriera]

I was able to create a starting guide for this. But there appears to be issues with the inner submodule of .Client. Unable to trouble shoot because I can't get the SDK to compile with Carthage either

// swift-tools-version:5.3
// The swift-tools-version declares the minimum version of Swift required to build this package.

import PackageDescription

let package = Package(
    name: "FiskalySDK",
    defaultLocalization: "en",
    platforms: [
        .iOS(.v9)
    ],
    products: [
        .library(
            name: "FiskalySDK",
            targets: ["FiskalySDK"]),
    ],
    dependencies: [],
    targets: [
        .target(name: "FiskalySDK",
                path: "FiskalySDK"),
        .testTarget(name: "FiskalySDKTests",
                    dependencies: ["FiskalySDK"],
                    path: "FiskalySDKTests"),
    ]
)

[prempador]

Thank you @raulriera for the feature request. I will take a look into it as soon as I have time.

[havocked]

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