Add a sell online form for sellers

[Ansh101112]

Currently there is no specific form for sellers to add there details which is necessary for the ecommerce to store the seller data in the db.

@arghadipmanna101 please assingn me this issue under gssoc'24.

[github-actions]

Hi there! Thanks for opening this issue. We appreciate your contribution to this open-source project. We aim to respond or assign your issue as soon as possible.