added stage notification and config

src/main/java/com/toofifty/easygiantsfoundry/EasyGiantsFoundryConfig.java

@@ -0,0 +1,22 @@
+package com.toofifty.easygiantsfoundry;
+
+import net.runelite.client.config.Config;
+import net.runelite.client.config.ConfigGroup;
+import net.runelite.client.config.ConfigItem;
+
+@ConfigGroup(EasyGiantsFoundryConfig.GROUP)
+public interface EasyGiantsFoundryConfig extends Config {
+    String GROUP = "easygiantsfoundry";
+
+    @ConfigItem(
+            keyName = "giantsFoundryStageNotification",
+            name = "Enable stage notifications",
+            description = "Configures whether to notify you when you are about to finish a stage.",
+            position = 0
+    )
+    default boolean showGiantsFoundryNotifications()
+    {
+        return true;
+    }
+
+}