Initial documentation structure

Change-Id: I73ac43b89327ea5784511befd36df25ed5048399
diff --git a/testing.rst b/testing.rst
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+Testing Guide
+=============
+
+
+.. toctree::
+   :maxdepth: 2
+   :hidden:
+   :glob:
+
+   testing/system
+   testing/component
+   testing/pipeline