added getIdAndAdminForList() method in Lobby to facilitate sending a list of lobbies to a client

src/main/java/ch/unibas/dmi/dbis/cs108/sebaschi/Lobby.java

@@ -79,6 +79,21 @@ public class Lobby {
     return this.lobbyID;
   }
 
+  /**
+   * Builds a message for the LISTL command.
+   * @return a string formatted for the clients convenients.
+   */
+  public String getIdAndAdminForList(){
+    StringBuilder response = new StringBuilder();
+    response.append("Lobby ID: ");
+    response.append(this.lobbyID);
+    response.append(" Admin Username: ");
+    response.append(getAdmin().getClientUserName());
+    response.append(System.lineSeparator());
+    LOGGER.info(response.toString());
+    return response.toString();
+  }
+
   /**
    * Adds a player to the lobby.
    * TODO: ad an appropriate response. Currently hardcoded.