Add a new item to catalog inventory.
Data input form with the following variables.
Uploading image calls UploadPhotoAsync passing in parameters for PhotoToUpload, imageName and storageContainer
if no image is selected when saving a new product record, a default placeholder image is inserted
Suggested image size: 640 x 480
Thumbnail size. 80 x 80
Image and thumbnail stored in Azure storeage container "products"
