doc: Update README.md

Author: jaywcjlove

README.md

@@ -152,6 +152,15 @@ export interface ReactCodeMirrorProps
   /** focus on the editor. */
   autoFocus?: boolean;
   theme?: 'light' | 'dark';
+  /**
+   * Whether to optional basicSetup by default
+   * @default true
+   */
+  basicSetup?: boolean;
+  /**
+   * Whether to optional basicSetup by default
+   * @default true
+   */
   /**
    * Fired whenever a change occurs to the document.
    */