This PR adds a barebones README to the `gpui` crate, just so folks have somewhere to land on when we link them here from [gpui.rs](https://www.gpui.rs/). We can flesh this out as we go. Release Notes: - N/A
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This PR adds a barebones README to the `gpui` crate, just so folks have somewhere to land on when we link them here from [gpui.rs](https://www.gpui.rs/). We can flesh this out as we go. Release Notes: - N/A