feat(auth): implement user authentication system

backend/node_modules/logform/ms.js

@@ -0,0 +1,18 @@
+'use strict';
+
+const format = require('./format');
+const ms = require('ms');
+
+/*
+ * function ms (info)
+ * Returns an `info` with a `ms` property. The `ms` property holds the Value
+ * of the time difference between two calls in milliseconds.
+ */
+module.exports = format(info => {
+  const curr = +new Date();
+  this.diff = curr - (this.prevTime || curr);
+  this.prevTime = curr;
+  info.ms = `+${ms(this.diff)}`;
+
+  return info;
+});