Added documentation readme.

Author: ajgdls

docs/README.md

@@ -0,0 +1,21 @@
+# Documentation
+
+Building the documentation has the following prerequisites:
+
+doxygen (www.doxygen.org)
+sphinx (www.sphinx-doc.org)
+breathe (https://github.com/michaeljones/breathe)
+
+Doxygen should be installed and found within the PATH environment variable.
+Sphinx should be installed and found within the PATH environment variable.
+Breathe is a python module and is expected to be found on the PYTHONPATH environment variable.
+
+To build the documentation into a set of html files:
+
+make html
+
+The documentation index page will be located at:
+
+./build/html/index.html
+
+