Create swift package

Sources/Cargo/xcframework/Extensions/PackageModel+Extensions.swift

@@ -0,0 +1,27 @@
+//
+//  PackageDescription+Extensions.swift
+//  swift-create-xcframework
+//
+//  Created by Rob Amos on 7/5/20.
+//
+
+import PackageModel
+
+extension ProductType {
+    var isLibrary: Bool {
+        if case .library = self {
+            return true
+        }
+        return false
+    }
+}
+
+extension Manifest {
+    var libraryProductNames: [String] {
+        products
+            .compactMap { product in
+                guard product.type.isLibrary else { return nil }
+                return product.name
+            }
+    }
+}