Refine documentation

Change-Id: I0d3387a520e3decf51bb0f7db53996f148a611d0
Signed-off-by: JingLu5 <lvjing5@huawei.com>
(cherry picked from commit 2347f3977823bfd0c4b1fa832d9046b8a625596b)

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+.. This work is licensed under a Creative Commons Attribution 4.0 International
+.. License.
+.. http://creativecommons.org/licenses/by/4.0
+.. (c) OPNFV, Huawei Technologies Co.,Ltd and others.
+
+Yardstick Restful API
+======================
+
+
+Abstract
+--------
+
+Yardstick support restful API in danube.
+
+
+Available API
+-------------
+
+/yardstick/env/action
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Description: This API is used to do some work related to environment. For now, we support:
+
+1. Prepare yardstick environment(Including fetch openrc file, get external network and load images)
+2. Start a InfluxDB docker container and config yardstick output to InfluxDB.
+3. Start a Grafana docker container and config with the InfluxDB.
+
+Which API to call will depend on the Parameters.
+
+
+Method: POST
+
+
+Prepare Yardstick Environment
+Example::
+
+    {
+        'action': 'prepareYardstickEnv'
+    }
+
+This is an asynchronous API. You need to call /yardstick/asynctask API to get the task result.
+
+
+Start and Config InfluxDB docker container
+Example::
+
+    {
+        'action': 'createInfluxDBContainer'
+    }
+
+This is an asynchronous API. You need to call /yardstick/asynctask API to get the task result.
+
+
+Start and Config Grafana docker container
+Example::
+
+    {
+        'action': 'createGrafanaContainer'
+    }
+
+This is an asynchronous API. You need to call /yardstick/asynctask API to get the task result.
+
+
+/yardstick/asynctask
+^^^^^^^^^^^^^^^^^^^^
+
+Description: This API is used to get the status of asynchronous task
+
+
+Method: GET
+
+
+Get the status of asynchronous task
+Example::
+
+    http://localhost:8888/yardstick/asynctask?task_id=3f3f5e03-972a-4847-a5f8-154f1b31db8c
+
+The returned status will be 0(running), 1(finished) and 2(failed).
+
+
+/yardstick/testcases
+^^^^^^^^^^^^^^^^^^^^
+
+Description: This API is used to list all release test cases now in yardstick.
+
+
+Method: GET
+
+
+Get a list of release test cases
+Example::
+
+    http://localhost:8888/yardstick/testcases
+
+
+/yardstick/testcases/release/action
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Description: This API is used to run a yardstick release test case.
+
+
+Method: POST
+
+
+Run a release test case
+Example::
+
+    {
+        'action': 'runTestCase',
+        'args': {
+            'opts': {},
+            'testcase': 'tc002'
+        }
+    }
+
+This is an asynchronous API. You need to call /yardstick/results to get the result.
+
+
+/yardstick/testcases/samples/action
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Description: This API is used to run a yardstick sample test case.
+
+
+Method: POST
+
+
+Run a sample test case
+Example::
+
+    {
+        'action': 'runTestCase',
+        'args': {
+            'opts': {},
+            'testcase': 'ping'
+        }
+    }
+
+This is an asynchronous API. You need to call /yardstick/results to get the result.
+
+
+/yardstick/testsuites/action
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Description: This API is used to run a yardstick test suite.
+
+
+Method: POST
+
+
+Run a test suite
+Example::
+
+    {
+        'action': 'runTestSuite',
+        'args': {
+            'opts': {},
+            'testcase': 'smoke'
+        }
+    }
+
+This is an asynchronous API. You need to call /yardstick/results to get the result.
+
+
+/yardstick/results
+^^^^^^^^^^^^^^^^^^
+
+
+Description: This API is used to get the test results of certain task. If you call /yardstick/testcases/samples/action API, it will return a task id. You can use the returned task id to get the results by using this API.
+
+
+Get test results of one task
+Example::
+
+    http://localhost:8888/yardstick/results?task_id=3f3f5e03-972a-4847-a5f8-154f1b31db8c
+
+This API will return a list of test case result