Initial documentation structure

Change-Id: I73ac43b89327ea5784511befd36df25ed5048399
diff --git a/testing/component.rst b/testing/component.rst
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+Component Tests (STC)
+=====================
diff --git a/testing/pipeline.rst b/testing/pipeline.rst
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+Pipeline Tests (PTF)
+====================
diff --git a/testing/system.rst b/testing/system.rst
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+System Integration Test (TestON)
+================================