feat(server): all-author and all-books roots

server/schema/schema.js

@@ -71,6 +71,18 @@ const RootQuery = new GraphQLObjectType({
       resolve (parent, args) {
         return _.find(authors, { id: args.id });
       }
+    },
+    books: {
+      type: new GraphQLList(BookType),
+      resolve (parent, args) {
+        return books;
+      }
+    },
+    authors: {
+      type: new GraphQLList(AuthorType),
+      resolve (parent, args) {
+        return authors;
+      }
     }
   }
 });