feat(react): initial skin scaffolding (#523)

Co-authored-by: Rahim <rahim.alwer@gmail.com>

packages/react/src/presets/background/index.ts

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+export * from './skin';

packages/react/src/presets/background/skin.css

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+.media-skin {
+  color: var(--media-color, red);
+}

packages/react/src/presets/background/skin.tsx

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+import type { BaseSkinProps } from '../types';
+
+export type BackgroundVideoSkinProps = BaseSkinProps;
+
+export function BackgroundVideoSkin(props: BackgroundVideoSkinProps) {
+  const { children } = props;
+  return <div>{children}</div>;
+}