Merge pull request #280 from sblondon/fix-doxygen-coc-warning

add Code of Conduct in generated documentation

Author: sharkwouter

Doxyfile

@@ -934,6 +934,7 @@ WARN_LOGFILE           =
 # Note: If this tag is empty the current directory is searched.
 
 INPUT                  = "README.md" \
+                         CODE_OF_CONDUCT.md \
                          src
 
 # This tag can be used to specify the character encoding of the source files