create getRoomByName resolver

+import { prisma, isAuthenticated } from "../../../utils";
+
+export default () => {
+  Query: {
+    getRoomByName: async (_, args, { request }) => {
+      isAuthenticated(request);
+      const { roomName } = args;
+      return prisma.room.findOne({
+        where: {
+          name: roomName,
+        },
+      });
+    };
+  }
+};