add docs about running up a simple WebDAV server..

NOTES.md

@@ -0,0 +1,15 @@
+Testing
+=======
+
+Any WebDAV server should be fine.  Any easy one to use is the wsgidav
+Python server.
+
+Simple setup:
+```
+$ virtualenv-3.7 p
+$ . ./p/bin/activate
+$ pip install wsgidav cheroot
+$ mkdir data
+$ truncate -s 1G data/somefile
+$ wsgidav --auth anonymous --host=0.0.0.0 --port=5555 --root=data
+```