feat: Make it possible to specify custom selectors

Fixes #1186

src/index.ts

@@ -63,6 +63,26 @@ export const load = getLoad(parse, (dom, options) =>
  */
 export default load([]);
 
+import { filters, pseudos, aliases } from 'cheerio-select';
+
+/**
+ * Extension points for adding custom pseudo selectors.
+ *
+ * @example <caption>Adds a custom pseudo selector `:classic`, which matches
+ * some fun HTML elements that are no more.</caption>
+ *
+ * ```js
+ * import { load, select } from 'cheerio';
+ *
+ * // Aliases are short hands for longer HTML selectors
+ * select.aliases.classic = 'marquee,blink';
+ *
+ * const $ = load(doc);
+ * $(':classic').html();
+ * ```
+ */
+export const select = { filters, pseudos, aliases };
+
 import * as staticMethods from './static';
 
 /**