Add guide for tests

Author: sinall

README.rst

@@ -46,6 +46,21 @@ ShiPanE-Python-SDK
 
 详见：examples/basic_example.py
 
+测试用例
+--------------
+
+实盘易 HTTP API 封装对应的测试用例见：
+
++------------+-------------------------------------------------+
+| 查询及下单 | tests/shipane_sdk/test_client.py                |
++------------+-------------------------------------------------+
+| 客户端管理 | tests/shipane_sdk/test_client_management.py     |
++------------+-------------------------------------------------+
+| 融资融券   | tests/shipane_sdk/test_client_margin_trading.py |
++------------+-------------------------------------------------+
+| 其他       | tests/shipane_sdk/...                           |
++------------+-------------------------------------------------+
+
 定时任务调度
 --------------