add query comment

Author: ahmad-moussawi

QueryBuilder/Query.cs

@@ -9,16 +9,19 @@ public partial class Query : BaseQuery<Query>
         public bool IsDistinct { get; set; } = false;
         public string QueryAlias { get; set; }
         public string Method { get; set; } = "select";
+        public string QueryComment { get; set; }
 
         public Query() : base()
         {
         }
 
-        public Query(string table) : base()
+        public Query(string table, string comment = null) : base()
         {
             From(table);
+            Comment(comment);
         }
 
+
         public bool HasOffset(string engineCode = null)
         {
             var limitOffset = this.GetOneComponent<LimitOffset>("limit", engineCode);
@@ -62,6 +65,12 @@ public Query As(string alias)
             return this;
         }
 
+        public Query Comment(string comment)
+        {
+            QueryComment = comment;
+            return this;
+        }
+
         public Query For(string engine, Func<Query, Query> fn)
         {
             EngineScope = engine;