[Feature Proposal] Media files URLs submission for Projects

Hello, everyone!

I see that there're many web-sites that act as kind of proxy or application gallery for Win-Get repository.

Those web-sites lack of proper images. So users can read not only descriptions, but see nice pictures, audio and video of software that is distributed.

Also I see there're different kind of media materials can be submitted in Android store and Windows store.

So therefore a proposal.

Add possibility to manifest to have optional media materials grouped by categories (union of Microsoft Store images/video/audio requirements and Android store images/video/audio requirements.

Validate availability of those images globally and its hash.

It will unlock other web-sites and application-wrappers around win-get to present vieos, pictures and audios around how application works.

The proposal does not name files, tests, or an entry point; begin by locating the manifest schema and its validation path in this repository. Done would require an agreed media model and validation behavior for availability and hashes, plus coverage for the supported media categories.

Written by the indexing model from the issue text.