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/Profile.cs

@@ -2,24 +2,87 @@ using System;
 
 namespace Oqtane.Models
 {
+    /// <summary>
+    /// A single Profile Property information of a <see cref="User"/>.  
+    /// So a user will have many of these to fully describe his Profile. 
+    /// </summary>
     public class Profile : IAuditable
     {
+        /// <summary>
+        /// Internal ID
+        /// </summary>
         public int ProfileId { get; set; }
+
+        /// <summary>
+        /// Reference to the <see cref="Site"/>.
+        /// It's nullable, probably because certain users like Super-Users don't specifically belong to any site.
+        /// </summary>
         public int? SiteId { get; set; }
+
+        /// <summary>
+        /// Name of the Profile-Property. _NOT_ the User-Name.
+        /// </summary>
         public string Name { get; set; }
+
+        /// <summary>
+        /// Title (label) of the Profile Property.
+        /// </summary>
         public string Title { get; set; }
+
+        /// <summary>
+        /// Description of the Property for the UI.
+        /// </summary>
         public string Description { get; set; }
+
+        /// <summary>
+        /// Category of this Profile-Property for grouping etc.
+        /// </summary>
         public string Category { get; set; }
+
+        /// <summary>
+        /// Order of the Property in the list of Profile-Properties.
+        /// </summary>
         public int ViewOrder { get; set; }
+
+        /// <summary>
+        /// Limits the input length of the property. 
+        /// </summary>
         public int MaxLength { get; set; }
+
+        /// <summary>
+        /// Initial/default value of this Property. 
+        /// </summary>
         public string DefaultValue { get; set; }
+
+        /// <summary>
+        /// Some Profile Properties are required - marked with this field.
+        /// </summary>
         public bool IsRequired { get; set; }
+
+        /// <summary>
+        /// Some Profile Properties are private, meaning other users won't see them. 
+        /// </summary>
         public bool IsPrivate { get; set; }
+
+        /// <summary>
+        /// This gives possible values for dropdown input fields. 
+        /// </summary>
         public string Options { get; set; }
 
+        #region IAuditable Properties
+
+        /// <inheritdoc/>
         public string CreatedBy { get; set; }
+
+        /// <inheritdoc/>
         public DateTime CreatedOn { get; set; }
+
+        /// <inheritdoc/>
         public string ModifiedBy { get; set; }
+
+        /// <inheritdoc/>
         public DateTime ModifiedOn { get; set; }
+
+        #endregion
     }
 }