started migration of user domain to ts

backend/src/errors/AppError.ts

@@ -0,0 +1,11 @@
+class AppError {
+  public readonly message: string;
+  public readonly statusCode: number;
+
+  constructor(message: string, statusCode = 400) {
+    this.message = message;
+    this.statusCode = statusCode;
+  }
+}
+
+export default AppError;