Add Swiftlint

Package.swift

@@ -9,7 +9,8 @@ let package = Package(
     dependencies: [
         // Dependencies declare other packages that this package depends on.
         .package(url: "https://github.com/apple/swift-argument-parser", from: "1.0.0"),
-        .package(url: "https://github.com/jpsim/Yams.git", from: "5.0.1")
+        .package(url: "https://github.com/jpsim/Yams.git", from: "5.0.1"),
+        .package(url: "https://github.com/realm/SwiftLint.git", .upToNextMajor(from: "0.54.0")),
     ],
     targets: [
         // Targets are the basic building blocks of a package. A target can define a module or a test suite.
@@ -20,7 +21,8 @@ let package = Package(
                 "ToolCore",
                 .product(name: "ArgumentParser", package: "swift-argument-parser"),
                 "Yams"
-            ]
+            ],
+            plugins: [.plugin(name: "SwiftLintPlugin", package: "SwiftLint")]
         ),
         
         // Helper targets