DOC: add responsive.css

[AKSHITHA-CHILUKA]

What's wrong with the existing documentation

we need to add new file

File to change

adding media queries and responsive design rules to ensure your site looks good on all devices.

Details of the change

No response

Type of change

adding new sections

Record

• I agree to follow this project's Code of Conduct
• I'm a GSSOC'24 contributor
• I want to work on this issue

[minakshikr7]

Please assign me this issue under @GSS0C24

[AKSHITHA-CHILUKA]

please assign me i want to complete the task