Preset the known values

[ggailey777]

https://github.com/Azure-Samples/integration-image-upload-resize-storage-functions/blob/e48ab0ee7acdb7e40ebb16f5021c933bc5228048/ImageResizeWebApp/ImageResizeWebApp/appsettings.json#L19

Since we already know the QueueName, ImageContainer, and ThumbnailContainer values expected by the function, can we just pre-set them here? That way, users only have to set the storage account and key.

[ggailey777]

OK, this was from my misunderstanding of how we were deploying this.

[richardjortega]

Actually this is valid, I can review it.

[SyntaxC4]

@ggailey777 & @richardjortega - Did this get implemented and is it ready to close?