update addCategory

-import { prisma } from "../../../utils";
+import { prisma, isAuthenticated } from "../../../utils";
+import { NEW_CATEGORY } from "../../../topics";
 
 export default {
   Mutation: {
-    addCategory: async (_, args) => {
+    addCategory: async (_, args, { request, pubsub }) => {
+      isAuthenticated(request);
       const { name } = args;
       const newCategory = await prisma.category.create({
         data: {
           name,
         },
       });
+      if (newCategory !== undefined) {
+        pubsub.publish(NEW_CATEGORY, { subCategory: newCategory });
+      }
       return newCategory;
     },
   },