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Login:-
    URL:- /login

    Method:- POST

    Data Type:- Form Data

    Data content:- {
            user_name: "<user name>",
            password: "<password>"
        }

    Response:-
        200 OK:-
            Data:- No
            Note:- Assume login completed.

        400 Bad Request:-
            Content Type:- text/plain
            Note:- user_name or password not given a Form Data.
            Data:- What is missing will be mentioned.

        403 Forbidden:-
            Content Type:- text/plain
            Note:- user_name or password is wrong, can display the response data to user.
            Data:- What is wrong will be mentioned, text that can be displayed on the screen.

    Example:-
        formData = new FormData();
        formData.append('name', 'John');
        formData.append('password', 'John123');
        fetch(
            "/login",
            {
                body: formData,
                method: "post"
            }
        );

        This will give a response status 200 with no data if login is done.
        This will return a 403 if the user gave wrong name or password.
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Add User:-
    URL:- /add_user

    Method:- POST

    Data Type:- Form Data

    Data content:- {
            user_name: "<user name>",
            password: "<password>"
        }

    Response:-
        200 OK:-
            Data:- No
            Note:- Assume success.

        400 Bad Request:-
            Content Type:- text/plain
            Note:- user_name or password not given a Form Data.
            Data:- What is missing will be mentioned.

        403 Forbidden:-
            Content Type:- text/plain
            Note:- user_name is exists, can display the response data to user.
            Data:- Text that can be displayed on the screen.

    Example:-
        formData = new FormData();
        formData.append('name', 'John');
        formData.append('password', 'John123');
        fetch(
            "/login",
            {
                body: formData,
                method: "post"
            }
        );

        This will give a response status 200 with no data if login is done.
        This will return a 403 if the user gave wrong name or password.
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