docs: Add minimal doxygen setup

Add a Doxyfile and the minimum required tags to the sources to make
anything useful appear in the documentation.

To generate just run: doxygen from the project root

docs: Add minimal doxygen setup

Add a Doxyfile and the minimum required tags to the sources to make
anything useful appear in the documentation.

To generate just run: doxygen from the project root or doxygen
./Doxyfile.

Change-Id: Ie60eb1458586dc0a7843dca69e969b78817260d3
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>

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