Add Tag suite coding guideline in CONTRIBUTING

Changes:
    - Add coding directive standard for openbmc test.

Note: The current code in the repository does not follow
     this guideline, and we plan to clean them up when this
     documentation is in force.

Tested:
    - NA

Change-Id: I1b8a60bff8e00cd423e539f1c57adc311bbe96a4
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 0fa88aa..13922b6 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -165,6 +165,17 @@
 
 - Tags:
 
+  - Create a tag for every test suite with a tag name that represents the suite
+    name as follows:
+
+    ```
+    Create a suite Tag name from the test file name
+    Example:
+        Suite:  test_boot_progress_code.robot
+
+        Force Tags    Boot_Progress_Code
+    ```
+
   - Create a tag for every test case with a tag name that mirrors the test case
     name as follows: