v2.8.0-pre.4

What's Changed

• Include MauiAssets in nuget package by @enisn in #578
• Update MAUI version to 8.0.7 by @enisn in #579
• Add README.md to packages & update version by @enisn in #580

Full Changelog: v2.8.0-pre.3...v2.8.0-pre.4