Add SwiftPM support (#3)

* Add SwiftPM support

* Fix package naming

Author: maxwellainatchi

.gitignore

@@ -25,3 +25,5 @@ coverage/
 *~
 *.dat
 *.dep
+
+.swiftpm/

Package.swift

@@ -0,0 +1,27 @@
+// swift-tools-version:5.1
+import PackageDescription
+
+let package = Package(
+    name: "UILabel+Copyable",
+    platforms: [
+        .iOS(.v12),
+    ],
+    products: [
+        .library(
+            name: "UILabel+Copyable",
+            targets: ["UILabel+Copyable"]),
+    ],
+    dependencies: [
+        // no dependencies
+    ],
+    targets: [
+        .target(
+            name: "UILabel+Copyable",
+            dependencies: [],
+            path: "UILabel+Copyable"),
+        .testTarget(
+            name: "UILabel+CopyableTests",
+            dependencies: ["UILabel+Copyable"],
+            path: "UILabel+CopyableTests"),
+    ]
+)