Is your feature request related to a problem? Please describe.
We need a command that will easily update the image assets in a manifest based on a single image. The command would take in an existing image and generate the different sizes and aspect ratios needed for best experience.

Describe the solution you'd like
winapp manifest update-assets <appxmanifest.xml path> <path-to-image>

Additional context
This will simplify the process of generating assets for appxmanifests