Add PostLoginEvent. Resolve #72

api/src/main/java/com/velocitypowered/api/event/connection/PostLoginEvent.java

@@ -0,0 +1,29 @@
+package com.velocitypowered.api.event.connection;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.proxy.Player;
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+/**
+ * This event is fired once the player has been successfully authenticated and
+ * fully initialized and player will be connected to server after this event
+ */
+public class PostLoginEvent {
+
+    private final Player player;
+
+    public PostLoginEvent(@NonNull Player player) {
+        this.player = Preconditions.checkNotNull(player, "player");
+    }
+
+    public Player getPlayer() {
+        return player;
+    }
+
+    @Override
+    public String toString() {
+        return "PostLoginEvent{"
+                + "player=" + player
+                + '}';
+    }
+}