add file api design(add to wishlist)

[obeidahr]

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[haithamalnaeb]

Thank you @obeidahr for your PR
good start,

There are some notes to take care of:

• you don't to create new file, move your code to apis.yaml and delete [API Design] add to wishlist.yml file.
• it would be great to re-read API Spec's contributing guideline and confirm your code.
• you should use /wishlist/{productId} endpoint, with POST method for add
• you only need to define productId parameter, in path, as int, no need for requestBody
• your 200 response does not have to return content (there is nothing to return except status code 200)

Please replay if you see any point is not logical, you can also discuss it in the group chat.

[haithamalnaeb]

Thank you @obeidahr
you are getting better 👍

however, we still need to add productId in path as /wishlist/{productId}
and use the method POST (for adding) instead of put (for update)
and use tags: wishlist instead of user
and add parameters like in delete from wisthlist
and finally, move components: section to the left one step (two spaces)