Add XML comments to public entities.

Interfaces/IWritableOpticalImage.cs

@@ -42,8 +42,14 @@ using Aaru.CommonTypes.Structs;
 
 namespace Aaru.CommonTypes.Interfaces
 {
+    /// <summary>
+    /// Defines an image that is writable and can store an optical disc (CD, DVD, etc)
+    /// </summary>
     public interface IWritableOpticalImage : IWritableImage, IOpticalMediaImage
     {
+        /// <summary>
+        /// Image format capabilities
+        /// </summary>
         OpticalImageCapabilities OpticalCapabilities { get; }
 
         /// <summary>Sets tracks for optical media</summary>