Added style class definitions to *Style.d.ts

components/lib/rating/style/RatingStyle.d.ts

@@ -1,3 +1,19 @@
+/**
+ *
+ * Rating component is a star based selection input.
+ *
+ * [Live Demo](https://www.primevue.org/rating/)
+ *
+ * @module ratingstyle
+ *
+ */
 import { BaseStyle } from '../../base/style';
 
+export enum RatingClasses {
+    root = 'p-rating',
+    option = 'p-rating-option',
+    onIcon = 'p-rating-on-icon',
+    offIcon = 'p-rating-off-icon'
+}
+
 export interface RatingStyle extends BaseStyle {}