RoomInfo 컴포넌트 추가

+import React, { useCallback, useContext, useEffect, useState } from 'react';
+import { useLocation, useParams } from 'react-router';
+import SocketContext from '../../contexts/SocketContext';
+import { MessageType } from '../common/types';
+import { RoomData, UpdateRoomUser } from './types';
+
+interface RoomInfoLocation {
+  state: { roomData: RoomData }
+}
+
+export const RoomInfo: React.FC = () => {
+  const socket = useContext(SocketContext);
+  const location: RoomInfoLocation = useLocation();
+
+  const [ roomData, setRoomData ] = useState<RoomData>({
+    // 기본값
+    uuid: '0',
+    name: 'loading...',
+    maxUsers: 9,
+    users: []
+  });
+
+  const handleUpdateRoomUser = useCallback((data: UpdateRoomUser) => {
+    if (data.state == 'added') {
+      setRoomData({
+        ...roomData,
+        users: [data.user, ...roomData.users] // TODO: immutable.js로 바꾸면 좋을 듯
+      });
+    } else if (data.state == 'removed') {
+      const newUsers = roomData.users;
+      const index = newUsers.indexOf(data.user);
+      if (index < 0) {
+        console.log('존재하지 않는 유저를 제거 시도');
+      } else {
+        newUsers.splice(index, 1);
+      }
+      setRoomData({
+        ...roomData,
+        users: newUsers
+      });
+    }
+  }, [roomData]);
+
+  useEffect(() => {
+    setRoomData(location.state.roomData);
+    socket.on(MessageType.ROOM_USER_UPDATE, handleUpdateRoomUser);
+
+    return () => {
+      socket.off(MessageType.ROOM_USER_UPDATE, handleUpdateRoomUser);
+    }
+  }, []);
+
+  return (
+    <div className='m-3 flex items-center place-content-between'>
+      <div>{roomData.name}</div>
+      <div>{roomData.users.length}/{roomData.maxUsers}</div>
+    </div>
+  );
+}
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@@ -7,6 +7,7 @@ import SocketContext from '../contexts/SocketContext';
 export const Room: React.FC = () => {
   return (
     <Main>
+      <RoomInfo />
     </Main>
   );
 }
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