Added room functionality

Websockets/RoomManager.cs

@@ -0,0 +1,43 @@
+namespace MauMau_Server.Websockets;
+
+public class RoomManager : IRoomManager
+{
+    private static readonly Dictionary<string, Room> Rooms = new();
+
+    public string CreateRoom()
+    {
+        var roomId = Guid.NewGuid().ToString();
+        var room = new Room();
+        Rooms.Add(roomId, room);
+        return roomId;
+    }
+    
+    public Room GetRoom(string roomId)
+    {
+        return Rooms[roomId];
+    }
+    
+    public List<string> GetAllRooms()
+    {
+        return Rooms.Keys.ToList();
+    }
+    
+    public void RemoveRoom(string roomId)
+    {
+        Rooms.Remove(roomId);
+    }
+    
+    public bool RoomExists(string roomId)
+    {
+        return Rooms.ContainsKey(roomId);
+    }
+}
+
+public interface IRoomManager
+{
+    public string CreateRoom();
+    public Room GetRoom(string roomId);
+    public List<string> GetAllRooms();
+    public void RemoveRoom(string roomId);
+    public bool RoomExists(string roomId);
+}