Note about VideoAV1 format

src/Video/VideoAV1.cs

@@ -3,6 +3,9 @@ using System.IO;
 
 namespace MoonWorks.Video
 {
+	/// <summary>
+	/// This class takes in a filename for AV1 data in .obu (open bitstream unit) format
+	/// </summary>
 	public unsafe class VideoAV1
 	{
 		public string Filename { get; }