Add XML comments to public entities.

Metadata/Dimensions.cs

@@ -42,8 +42,16 @@ using Schemas;
 
 namespace Aaru.CommonTypes.Metadata
 {
+    /// <summary>
+    /// Physical dimensions for media types
+    /// </summary>
     public static class Dimensions
     {
+        /// <summary>
+        /// Gets the physical dimensions, in metadata expected format, for a given media type
+        /// </summary>
+        /// <param name="dskType">Media type</param>
+        /// <returns>Dimensions metadata</returns>
         public static DimensionsType DimensionsFromMediaType(CommonTypes.MediaType dskType)
         {
             var dmns = new DimensionsType();