Update README.md documentation

Added:
   - CI and smoke test bucket execution section.

Change-Id: I6eeb3b11234ac05b1ac25ee6d83998a06e3efbd0
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/README.md b/README.md
index e9dc636..57932eb 100755
--- a/README.md
+++ b/README.md
@@ -169,7 +169,6 @@
     ```
     $ OPENBMC_HOST=x.x.x.x tox -e default -- tests
     ```
-    Default CI test bucket list:
 
     No preset environment variables, the entire test suite excluding test
     cases using argument file:
@@ -184,6 +183,18 @@
     Witherspoon:  test_lists/skip_test_witherspoon
     ```
 
+* How to run CI and CT bucket test:
+
+    Default CI test bucket list:
+    ```
+    $ OPENBMC_HOST=x.x.x.x tox -e default -- --argumentfile test_lists/HW_CI tests
+    ```
+
+    Default CI smoke test bucket list:
+    ```
+    $ OPENBMC_HOST=x.x.x.x tox -e default -- --argumentfile test_lists/CT_basic_run tests
+    ```
+
 * Run extended tests:
 
     For BMC code update, download the system type *.all.tar image from https://openpower.xyz