feat(auth): implement user authentication system

backend/node_modules/@babel/helper-validator-identifier/README.md

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+# @babel/helper-validator-identifier
+
+> Validate identifier/keywords name
+
+See our website [@babel/helper-validator-identifier](https://babeljs.io/docs/babel-helper-validator-identifier) for more information.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save @babel/helper-validator-identifier
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/helper-validator-identifier
+```