feat(auth): implement user authentication system

backend/node_modules/mysql2/lib/promise/make_done_cb.js

@@ -0,0 +1,19 @@
+'use strict';
+
+function makeDoneCb(resolve, reject, localErr) {
+  return function (err, rows, fields) {
+    if (err) {
+      localErr.message = err.message;
+      localErr.code = err.code;
+      localErr.errno = err.errno;
+      localErr.sql = err.sql;
+      localErr.sqlState = err.sqlState;
+      localErr.sqlMessage = err.sqlMessage;
+      reject(localErr);
+    } else {
+      resolve([rows, fields]);
+    }
+  };
+}
+
+module.exports = makeDoneCb;