Adding changes as requested for code review

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/Contracts/ResultSetSubset.cs

@@ -1,13 +1,24 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
 
 namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.Contracts
 {
+    /// <summary>
+    /// Class used to represent a subset of results from a query for transmission across JSON RPC
+    /// </summary>
     public class ResultSetSubset
     {
+        /// <summary>
+        /// The number of rows returned from result set, useful for determining if less rows were
+        /// returned than requested.
+        /// </summary>
         public int RowCount { get; set; }
+
+        /// <summary>
+        /// 2D array of the cell values requested from result set
+        /// </summary>
         public object[][] Rows { get; set; }
     }
 }