feat: added signup route

[AshutoshSingh2021]

This pull request introduces a new feature to our application - a signup route. The signup route allows new users to create accounts and join our platform. Here's an overview of the changes included in this pull request:

Changes:

• Added a new route for user signup (POST /auth/signup) in the routes/auth.js file.
• Implemented password hashing using the bcrypt package to securely store user passwords.
• Used jsonwebtoken package for enhanced security and easy access for the users.
• Created a new User model in the models/User.js file to store user information in the MongoDB database.
• Updated the index.js file to include the necessary middleware and route handling for the signup route.

Testing:

• Tested the signup route using tools like Postman to ensure that new users can successfully create accounts.

  

• Verified that passwords are securely hashed before being stored in the database.

  

• Checked for proper error handling and validation of user input.

  

Additional Notes:

• This feature aligns with our project's goals of providing a seamless user experience and enhancing security.
• Any feedback or suggestions for improvement are welcome.

[AshutoshSingh2021]

@aanshu-kumar please review my PR.

[aanshu-kumar]

This merge marks the beginning of our project. Thank you @AshutoshSingh2021