created apis for handling login and signup

[abhayksahu369]

48 done

created apis for handling login and signup request from frontend

• the api will let user register and login
• the api will store user's username,email and password in the mongodb database
• please create a .env file and add MONGODB_URL=you_mongodb_database_url
• create a mongodb Atlas database for this app and copy the link and put it in .env file

[vercel[bot]]

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