adding the breathe files

doc/breathe/__init__.py

@@ -0,0 +1,16 @@
+
+__version__ = '4.0.0'
+
+
+def setup(app):
+
+    # We can't do the import at the module scope as setup.py has to be able to
+    # import this file to read __version__ without hitting any syntax errors
+    # from both Python 2 & Python 3.
+
+    # By the time this function is called, the directives code will have been
+    # converted with 2to3 if appropriate
+
+    from . import directives
+
+    directives.setup(app)