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/PermissionString.cs

@@ -1,8 +1,18 @@
-namespace Oqtane.Models
+namespace Oqtane.Models
 {
+    /// <summary>
+    /// Use this to define a <see cref="PermissionName"/> which addresses a set of multiple permissions.
+    /// </summary>
     public class PermissionString
     {
+        /// <summary>
+        /// A term describing a set of permissions
+        /// </summary>
         public string PermissionName { get; set; }
+
+        /// <summary>
+        /// The permissions addressed with this name
+        /// </summary>
         public string Permissions { get; set; }
     }
 }