More documentation - almost all Models done

https://github.com/oqtane/oqtane.framework/issues/1382
Should not contain any code changes, just docs

Oqtane.Shared/Models/Package.cs

@@ -1,12 +1,39 @@
-namespace Oqtane.Models
+namespace Oqtane.Models
 {
+    /// <summary>
+    /// A software Package which is like an Oqtane Plugin / Extension.
+    /// This is used for creating lists from NuGet to offer for installation. 
+    /// </summary>
     public class Package
     {
+        /// <summary>
+        /// ID of the Package. Usually constructed of the Namespace.
+        /// </summary>
         public string PackageId { get; set; }
+
+        /// <summary>
+        /// Name of the package - may contains part or the entire Namespace.
+        /// </summary>
         public string Name { get; set; }
+
+        /// <summary>
+        /// Nice description of the Package. 
+        /// </summary>
         public string Description { get; set; }
+
+        /// <summary>
+        /// Owner / Creator of the package - usually retrieved from NuGet.
+        /// </summary>
         public string Owner { get; set; }
+
+        /// <summary>
+        /// Version as defined in the NuGet package. 
+        /// </summary>
         public string Version { get; set; }
+
+        /// <summary>
+        /// Download count on NuGet to show how popular the package is. 
+        /// </summary>
         public long Downloads { get; set; }
     }
 }