Document project scope and status

I find the idea of a native wgpu based renderer amazing, however I wonder how much is planned to be implemented to be on parity with the web based alternatives. Perhaps having a compatibility table would be nice? Going beyond the PoC seems like a major effort to replicate the many things a web view does(e.g. accessibility, text input, grid model, animations/transitions, css custom props, no web components 😢, etc.)

The issue names no files, tests, or entry points. Start by reviewing the current native wgpu renderer and comparing its supported features with the web-based alternatives listed in the issue. Done means a project-scope document or compatibility table that records current status and planned coverage.

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