Create swift package

Sources/Cargo/Commands/Cargo.swift

@@ -0,0 +1,22 @@
+import ArgumentParser
+import Foundation
+
+@main
+struct Cargo: AsyncParsableCommand {
+    static let configuration: CommandConfiguration = {
+        if let directory = ProcessInfo.processInfo.environment["BUILD_WORKSPACE_DIRECTORY"] {
+            FileManager.default.changeCurrentDirectoryPath(directory)
+        }
+
+        return CommandConfiguration(
+            commandName: "cargo",
+            abstract: "A tool to build `rust` projects with `cargo`.",
+            version: Version.value,
+            subcommands: [
+                Build.self,
+                Version.self
+            ],
+            defaultSubcommand: Build.self
+        )
+    }()
+}