Added Swift Package Manager support

.gitignore

@@ -25,3 +25,4 @@ Doc/
 Pods
 /Podfile.lock
 Carthage/
+/.build

Package.swift

@@ -0,0 +1,17 @@
+// swift-tools-version:5.0
+//
+// MatomoTracker
+//
+
+import PackageDescription
+
+let package = Package(
+  name: "MatomoTracker",
+  products: [
+      .library(name: "MatomoTracker", targets: ["MatomoTracker"])
+  ],
+  targets: [
+      .target(name: "MatomoTracker", dependencies: [], path: "MatomoTracker"),
+  ],
+  swiftLanguageVersions: [.v5]
+)

Rakefile

@@ -42,6 +42,12 @@ namespace :package_manager do
     sh("carthage build --no-skip-current") rescue nil
     package_manager_failed('Carthage integration') unless $?.success?
   end
+
+  desc 'Builds the project with the Swift Package Manager'
+  task spm: :prepare do
+    sh("swift build") rescue nil
+    package_manager_failed('Swift Package Manager') unless $?.success?
+  end
 end
 
 
@@ -56,6 +62,7 @@ end
 desc 'Check the integration of MatomoTracker with package managers'
 task :build_with_package_manager do
   Rake::Task['package_manager:carthage'].invoke
+  Rake::Task['package_manager:spm'].invoke
 end
 
 task default: 'test'