dynamic query support.

Demo/DynamicQueries/Contact.cs

@@ -0,0 +1,29 @@
+using PoweredSoft.CQRS.DynamicQuery.Abstractions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Demo.DynamicQueries
+{
+    public class Contact
+    {
+        public long Id { get; set; }
+        public string DisplayName { get; set; }
+    }
+
+    public class ContactQueryableProvider : IQueryableProvider<Contact>
+    {
+        public Task<IQueryable<Contact>> GetQueryableAsync(object query, CancellationToken cancelllationToken = default)
+        {
+            var ret = new List<Contact>
+            {
+                new Contact { Id = 1, DisplayName = "David L"},
+                new Contact { Id = 2, DisplayName = "John Doe"} 
+            };
+
+            return Task.FromResult(ret.AsQueryable());
+        }
+    }
+}