Add sphinx documentation for tracetools_test

Signed-off-by: Christophe Bedard <bedard.christophe@gmail.com>

tracetools_test/docs/source/index.rst

@@ -0,0 +1,17 @@
+tracetools_test
+===============
+
+tracetools_test provides testing utilities and tests for the `tracetools package <https://index.ros.org/p/tracetools/>`_.
+
+.. toctree::
+   :maxdepth: 3
+
+   about
+   api
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`