Add a room view

Change-Id: I20056d997e7a94fd10d03e7d1a8051030ecf7ca4

src/App.js

@@ -4,8 +4,10 @@ import polyglotI18nProvider from "ra-i18n-polyglot";
 import authProvider from "./synapse/authProvider";
 import dataProvider from "./synapse/dataProvider";
 import { UserList, UserCreate, UserEdit } from "./components/users";
+import { RoomList } from "./components/rooms";
 import LoginPage from "./components/LoginPage";
 import UserIcon from "@material-ui/icons/Group";
+import { ViewListIcon as RoomIcon } from "@material-ui/icons/ViewList";
 import germanMessages from "./i18n/de";
 import englishMessages from "./i18n/en";
 
@@ -33,6 +35,7 @@ const App = () => (
       edit={UserEdit}
       icon={UserIcon}
     />
+    <Resource name="rooms" list={RoomList} icon={RoomIcon} />
   </Admin>
 );