WIP for QueryExecution, mostly complete

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

@@ -0,0 +1,22 @@
+using System.Data.Common;
+
+namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.Contracts
+{
+    public class ResultSetSummary
+    {
+        /// <summary>
+        /// The ID of the result set within the query results
+        /// </summary>
+        public int Id { get; set; }
+
+        /// <summary>
+        /// The number of rows that was returned with the resultset
+        /// </summary>
+        public int RowCount { get; set; }
+
+        /// <summary>
+        /// Details about the columns that are provided as solutions
+        /// </summary>
+        public DbColumn[] ColumnInfo { get; set; }
+    }
+}