[LFS] Implemented screenshot event

LagFreeScreenshots/EventHandler.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace LagFreeScreenshots
+{
+    public static class EventHandler
+    {
+        /// <summary>
+        /// Calls when an screenshot is saved
+        /// </summary>
+        public static event Action<string, int, int, Metadata> OnScreenshotSaved;
+
+        internal static void InvokeScreenshotSaved(string filePath, int width, int height, Metadata metadata) => OnScreenshotSaved?.Invoke(filePath, width, height, metadata);
+    }
+}