Addd demo

Src/Asp.NetCore2/SqliteTest/Demo/Demo1_Queryable.cs

@@ -42,6 +42,7 @@ namespace OrmTest
             var getByWhere2 = db.Queryable<Order>().Where(it => it.Id == DateTime.Now.Year).ToList();
             var getByFuns = db.Queryable<Order>().Where(it => SqlFunc.IsNullOrEmpty(it.Name)).ToList();
             var getByFuns2 = db.Queryable<Order>().GroupBy(it => it.Name).Select(it => SqlFunc.AggregateDistinctCount(it.Price)).ToList();
+            var list8 = db.Queryable<Order>().ToDictionary(it => SqlFunc.Trim(it.Id), it => it);
             Console.WriteLine("#### Examples End ####");
         }