Added PlayerJoinGameEvent.java class (#30)

src/main/java/dev/kavu/gameapi/event/PlayerJoinGameEvent.java

@@ -0,0 +1,42 @@
+package dev.kavu.gameapi.event;
+
+import dev.kavu.gameapi.game.GameType;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+
+public class PlayerJoinGameEvent extends PlayerGameEvent implements Cancellable {
+
+    private static final HandlerList handlers = new HandlerList();
+
+    private final int playerCount;
+    private boolean cancelled;
+
+    public PlayerJoinGameEvent(GameType gameType, Player player, int playerCount) {
+        super(gameType, player);
+        this.playerCount = playerCount;
+    }
+
+    public int getPlayerCount() {
+        return playerCount;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    @Override
+    public void setCancelled(boolean cancel) {
+        this.cancelled = cancel;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+}