Update README.md

README.md

@@ -1,2 +1,30 @@
 # MiniGameAPI
 PocketMine-MP easily implement minigames.
+
+### Usage
+
+#### Make GameRoom class.
+
+```php
+class MafiaGameRoom extends \skh6075\MiniGameAPI\game\GameRoom{
+}
+```
+
+#### Register GameRoom class.
+
+```php
+$teamFactory = new \skh6075\MiniGameAPI\team\TeamFactory (
+    new \skh6075\MiniGameAPI\team\Team ("citizen"),
+    new \skh6075\MiniGameAPI\team\Team ("mafia"),
+    new \skh6075\MiniGameAPI\team\Team ("police"),
+    new \skh6075\MiniGameAPI\team\Team ("doctor"),
+    new \skh6075\MiniGameAPI\team\Team ("repoter"),
+    new \skh6075\MiniGameAPI\team\Team ("spy")
+);
+$minPlayer = 8;
+$maxPlayer = 12;
+$room = new MafiaGameRoom ("mafia", $minPlayer, $maxPlayer, $teamFactory);
+\skh6075\MiniGameAPI\MiniGameFactory::addGameRoom ($room);
+```
+
+- Implement the rest of the coding in the MafiaGameRoom class by yourself.