Add SqlSugarClient.GetDate()

Src/Asp.Net/SqlServerTest/Demos/1_Query.cs

@@ -242,6 +242,7 @@ namespace OrmTest.Demo
         public static void Easy()
         {
             var db = GetInstance();
+            var dbTime = db.GetDate();
             var getAll = db.Queryable<Student>().ToList();
             var getAllOrder = db.Queryable<Student>().OrderBy(it => it.Id).OrderBy(it => it.Name, OrderByType.Desc).ToList();
             var getId = db.Queryable<Student>().Select(it => it.Id).ToList();