add docs

.docs/content/2.Api/6.ProviderControls.getMetadata.md

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+# `ProviderControls.getMetadata`
+
+Get meta data for a scraper, can be either source or embed scraper.
+Returns null if id is not recognized.
+
+## Example
+
+```ts
+const flixhqSource = providers.getMetadata('flixhq');
+```
+
+## Type
+
+```ts
+function getMetadata(id: string): MetaOutput | null;
+
+type MetaOutput = {
+  type: 'embed' | 'source';
+  id: string;
+  rank: number;
+  name: string;
+  mediaTypes?: Array<MediaTypes>;
+};
+```