README.md in cevennes-0.9.0 vs README.md in cevennes-0.10.0

@@ -7,9 +7,16 @@
 Diffs CSVs by lines, focusing on a single ID
 
 ## usage
 
 TODO
+```
+csv0 = %{
+  }
+csv1 = %{
+  }
+pp Cevennes.diff('ISIN', csv0, csv1)
+```
 
 ## LICENSE
 
 MIT, see [LICENSE.txt](LICENSE.txt)