update README

README.md

@@ -2,3 +2,11 @@
 
     cd /path/to/source
     docker run --rm -v $(pwd):/data -it cwpearson/doxygen doxygen
+
+## Makefiles
+
+Consider adding the following to a makefile to use this to build docs
+
+    docker_docs:
+        docker run -it --rm -v `pwd`:/data cwpearson/doxygen  doxygen doxygen.config
+        docker run -it --rm -v `readlink -f docs/latex`:/data cwpearson/doxygen make