Add product comments (#54)

src/resolvers/products-resolver.ts

@@ -250,4 +250,11 @@ export const productMutationTypeDefs = {
     );
     return (<ProductAPI>dataSources.productApi).getProduct(productId);
   },
+  async updateProductComments(_, { productId, comments }, { dataSources }) {
+    await (<ProductAPI>dataSources.productApi).updateComments(
+      productId,
+      comments,
+    );
+    return (<ProductAPI>dataSources.productApi).getProduct(productId);
+  },
 };