WIP for QueryExecution, mostly complete

src/Microsoft.SqlTools.ServiceLayer/QueryExecution/ResultSet.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.Data.Common;
+
+namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.Contracts
+{
+    public class ResultSet
+    {
+        public DbColumn[] Columns { get; set; }
+
+        public List<object[]> Rows { get; private set; }
+
+        public ResultSet()
+        {
+            Rows = new List<object[]>();
+        }
+
+        /// <summary>
+        /// Add a row of data to the result set using a <see cref="DbDataReader"/> that has already
+        /// read in a row.
+        /// </summary>
+        /// <param name="reader">A <see cref="DbDataReader"/> that has already had a read performed</param>
+        public void AddRow(DbDataReader reader)
+        {
+            List<object> row = new List<object>();
+            for (int i = 0; i < reader.FieldCount; ++i)
+            {
+                row.Add(reader.GetValue(i));
+            }
+            Rows.Add(row.ToArray());
+        }
+    }
+}