Create swift package

Sources/Cargo/swiftlint/Commands/SwiftLint.swift

@@ -0,0 +1,26 @@
+import ArgumentParser
+import Foundation
+
+@main
+struct SwiftLint: AsyncParsableCommand {
+    static let configuration: CommandConfiguration = {
+        if let directory = ProcessInfo.processInfo.environment["BUILD_WORKSPACE_DIRECTORY"] {
+            FileManager.default.changeCurrentDirectoryPath(directory)
+        }
+
+        return CommandConfiguration(
+            commandName: "swiftlint",
+            abstract: "A tool to enforce Swift style and conventions.",
+            version: Version.value,
+            subcommands: [
+                Analyze.self,
+                Docs.self,
+                GenerateDocs.self,
+                Lint.self,
+                Rules.self,
+                Version.self
+            ],
+            defaultSubcommand: Lint.self
+        )
+    }()
+}