Add Swift Package Manager support

Author: dreampiggy

.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,30 @@
+// swift-tools-version:5.1
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "SDWebImageSwiftUI",
+    platforms: [
+       .macOS(.v10_15), .iOS(.v13), .tvOS(.v13), .watchOS(.v6)
+    ],
+    products: [
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "SDWebImageSwiftUI",
+            targets: ["SDWebImageSwiftUI"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+        .package(url: "https://github.com/SDWebImage/SDWebImage.git", from: "5.1.0")
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(
+            name: "SDWebImageSwiftUI",
+            dependencies: ["SDWebImage"],
+            path: "SDWebImageSwiftUI/Classes"),
+    ]
+)