add example to the top of readme

Author: robertjwilson

README.md

@@ -14,6 +14,8 @@ Ocean model validation made easy in Python.
 
 To learn more about the package, visit the [OceanVal website](https://oceanval.readthedocs.io/en/latest/). The
 
+OceanVal is designed for the automated creation of validation reports. You provide the model and validation data. OceanVal does the rest. A short example of what the report looks like can be found [here](https://pmlmodelling.github.io/oceanval_example/intro.html). 
+
 
 # Installation