created bacis structure and routes for creating user and logging in

backend/middleware/errorMiddleWare.js

@@ -0,0 +1,9 @@
+const errorHandler = (err, req, res, next) => {
+  const statusCode = res.statusCode ? res.statusCode : 500;
+  res.status(statusCode);
+  res.json({
+    message: err.message,
+    stack: process.env.NODE_ENV === "production" ? null : err.stack,
+  });
+};
+module.exports = { errorHandler };