You can find basic apps for using the OpenConfig BGP model at:
https://github.com/CiscoDevNet/ydk-py-samples/tree/master/samples/basic/ydk/models/bgp
More sample apps for this model are coming down the road, but these should get you going.
Make sure you read the README file for basic apps. It explains how apps are named and how to run them.
https://github.com/CiscoDevNet/ydk-py-samples/tree/master/samples/basic
Enjoy!