Add bevy_asset_preview and bevy_marketplace_viewer crates

crates/bevy_asset_preview/Cargo.toml

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+[package]
+name = "bevy_asset_preview"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+bevy.workspace = true

crates/bevy_asset_preview/src/lib.rs

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+use bevy::prelude::*;
+
+/// This crate is a work in progress and is not yet ready for use.
+/// The intention is to provide a way to load/render/unload assets in the background and provide previews of them in the Bevy Editor.
+/// For 2d assets this will be a simple sprite, for 3d assets this will require a quick render of the asset at a low resolution, just enough for a user to be able to tell quickly what it is.
+/// This code may be reused for the Bevy Marketplace Viewer to provide previews of assets and plugins.
+/// So long as the assets are unchanged, the previews will be cached and will not need to be re-rendered.
+/// In theory this can be done passively in the background, and the previews will be ready when the user needs them.
+
+pub struct AssetPreviewPlugin;
+#[allow(unused_variables)]
+impl Plugin for AssetPreviewPlugin {
+ fn build(&self, _app: &mut App) {}
+}

crates/bevy_marketplace_viewer/Cargo.toml

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+[package]
+name = "bevy_marketplace_viewer"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+bevy.workspace = true

crates/bevy_marketplace_viewer/src/lib.rs

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+use bevy::prelude::*;
+
+/// A Viewer for the Future Bevy Marketplace, a place where you can find Bevy plugins and assets that members of the community have created.
+/// This crate is a work in progress and is not yet ready for use.
+/// The intention is to provide a way to browse the marketplace and install plugins and assets directly from the Bevy Editor.
+/// Particularly, this crate will connect to the Bevy Marketplace API to fetch the latest plugins and assets, and provide previews, overviews, and (If any) prices of them.
+/// If the crate is present in the editor (aka not been removed, or disabled).
+/// The crate will pass this data to the asset browser crate to be displayed in the Bevy Editor.
+/// The UI/UX of the content will live in the asset browser crate, and this crate will only be responsible for fetching the data.
+/// As a security measure purchasing of assets/plugins will be done through the Bevy Marketplace website.
+
+pub struct MarketplaceViewerPlugin;
+#[allow(unused_variables)]
+impl Plugin for MarketplaceViewerPlugin {
+ fn build(&self, _app: &mut App) {}
+}