Make note about debug==false losing CSS

Close #13

Author: kraigb

README.md

@@ -10,7 +10,12 @@ To run the sample:
 1. Create and initialize the database by running `python manage.py migrate`.
 1. Create a superuser as described at the end of the tutorial.
 
-Contributions to the sample are welcome. When submitting changes, also consider submitting matching changes to the tutorial, the source file for which is [tutorial-django.md](https://github.com/Microsoft/vscode-docs/blob/master/docs/python/tutorial-django.md).
+Contributions to the sample are welcome. When submitting changes, also consider submitting matching changes to the tutorial, the source file for which is [tutorial-django.md]
+(https://github.com/Microsoft/vscode-docs/blob/master/docs/python/tutorial-django.md).
+
+# Known issues
+
+- CSS is lost when debug == false: the workaround is to include an added script at the end of dockerfile.txt. See [Issue 13](https://github.com/Microsoft/python-sample-vscode-django-tutorial/issues/13) for details.
 
 # Contributing