started writing tutorial

README.md

@@ -13,3 +13,15 @@ cd lassie
 sudo python setup.py install
 ```
 
+## Tutorial: detecting events in a regional network
+
+This tutorial explains how to use Lassie to detect events in a regional
+network. The one-day test dataset from the Alentejo region in South
+Portugal used here is available for download from
+http://kinherd.org/lassie-example-alentejo.tar (171 MB). Data from 12 seismic
+stations from the
+[DOCTAR](http://www.geo.uni-potsdam.de/doctar-1317/articles/doctar-1317.html)
+experiment and from 5 permanent stations from regional networks are included. A
+region of roughly 100 x 100 km is covered by the available data.
+
+