Add example using md5sum in test data

Author: david4096

README.md

@@ -26,6 +26,8 @@ $ wes-server
 
 Note! All inputs files must be accessible from the filesystem.
 
+Note! All inputs files must be accessible from the filesystem.
+
 ```
 $ wes-client --host=localhost:8080 testdata/md5sum.cwl testdata/md5sum.cwl.json
 ```