Add mutation for wallpaper types (#41)

src/resolvers/products-resolver.ts

@@ -127,4 +127,15 @@ export const productMutationTypeDefs = {
     );
     return (<ProductAPI>dataSources.productApi).getProduct(productId);
   },
+  async productWallpaperType(
+    _,
+    { productId, wallpaperTypes },
+    { dataSources },
+  ) {
+    await (<ProductAPI>dataSources.productApi).setWallpaperTypes(
+      productId,
+      wallpaperTypes,
+    );
+    return (<ProductAPI>dataSources.productApi).getProduct(productId);
+  },
 };