docs: add XML documentation to PepperDash.Core project

Co-authored-by: andrew-welker <1765622+andrew-welker@users.noreply.github.com>

src/PepperDash.Core/Web/RequestHandlers/DefaultRequestHandler.cs

@@ -5,6 +5,9 @@ namespace PepperDash.Core.Web.RequestHandlers
 	/// <summary>
 	/// Web API default request handler
 	/// </summary>
+ /// <summary>
+ /// Represents a DefaultRequestHandler
+ /// </summary>
 	public class DefaultRequestHandler : WebApiBaseRequestHandler
 	{
 		/// <summary>

src/PepperDash.Core/Web/RequestHandlers/WebApiBaseRequestAsyncHandler.cs

@@ -142,6 +142,9 @@ namespace PepperDash.Core.Web.RequestHandlers
         /// Process request
         /// </summary>
         /// <param name="context"></param>
+        /// <summary>
+        /// ProcessRequest method
+        /// </summary>
         public void ProcessRequest(HttpCwsContext context)
         {
             if (!_handlers.TryGetValue(context.Request.HttpMethod, out Func<HttpCwsContext, Task> handler))

src/PepperDash.Core/Web/RequestHandlers/WebApiBaseRequestHandler.cs

@@ -144,6 +144,9 @@ namespace PepperDash.Core.Web.RequestHandlers
 		/// Process request
 		/// </summary>
 		/// <param name="context"></param>
+  /// <summary>
+  /// ProcessRequest method
+  /// </summary>
 		public void ProcessRequest(HttpCwsContext context)
 		{
 			Action<HttpCwsContext> handler;