Add RenderSession.WithOutputPath

Util/FileUtil.cs

@@ -1,6 +1,11 @@
-namespace ADOFAIRenderer.Util;
+using System.IO;
 
-public class FileUtil
+namespace ADOFAIRenderer.Util;
+
+internal static class FileUtil
 {
-    
+    public static void CreateDirectory(string path)
+    {
+        if (!Directory.Exists(path)) Directory.CreateDirectory(path);
+    }
 }