XCode project for app, moved app project to folder

SideStoreApp/Sources/Cargo/swiftlint/Helpers/SwiftLintError.swift

@@ -0,0 +1,12 @@
+import Foundation
+
+enum SwiftLintError: LocalizedError {
+    case usageError(description: String)
+
+    var errorDescription: String? {
+        switch self {
+        case .usageError(let description):
+            return description
+        }
+    }
+}