feat(html): setup player api (#374)

packages/html/src/player/context.ts

@@ -0,0 +1,16 @@
+import { type Context, createContext } from '@lit/context';
+import type { AnyPlayerStore, Media, PlayerStore } from '@videojs/core/dom';
+
+export const PLAYER_CONTEXT_KEY = Symbol('@videojs/player');
+
+export interface PlayerContextValue<Store extends PlayerStore = AnyPlayerStore> {
+  store: Store;
+  media: Media | null;
+}
+
+export type PlayerContext<Store extends PlayerStore = AnyPlayerStore> = Context<
+  typeof PLAYER_CONTEXT_KEY,
+  PlayerContextValue<Store>
+>;
+
+export const playerContext = createContext<PlayerContextValue, typeof PLAYER_CONTEXT_KEY>(PLAYER_CONTEXT_KEY);