update readme

README.md

@@ -60,6 +60,10 @@ predict(alleles=['A0201'], peptides=['SIINFEKL'])
 0  A0201  SIINFEKL  10672.347656
 ```
 
+## Example notebook
+See the [class1_allele_specific_models.ipynb](https://github.com/hammerlab/mhcflurry/blob/master/examples/class1_allele_specific_models.ipynb] notebook for an overview of the MHCflurry Python API, including predicting, fitting, and scoring models.
+
+
 ## Training your own models
 
 This [unit test](https://github.com/hammerlab/mhcflurry/blob/master/test/test_class1_binding_predictor_A0205.py) gives a simple example of how to train a predictor in Python. There is also a script called `mhcflurry-class1-allele-specific-cv-and-train` that will perform cross validation and model selection given a CSV file of training data. Try `mhcflurry-class1-allele-specific-cv-and-train --help` for details.