Add "create listings" for the admin page

[jolynleow2301]

No description provided.

[damiancxliew]

Thanks for the updates Jolyn. Can I ask for your help to fetch new changes and make changes to the following?

1. For your apiRequest in "CreateListing.tsx", please change from "apiRequest("listings", "POST", "register",...)" to "apiRequest("product", "POST", "create", ....)".

2. From the data you submit to the apiRequest, I see that you are submitting these data
   "title,
   description,
   images,
   sizingChart,
   specifications,
   deliveryMethods,
   collectionInfo,"
   to the database, thus please help to ensure you make amendments to the validation schema in "products.js" file under "server/src/models/products.js" to ensure there is no error when writing the data to the database.

Thank you!