Add details of how to use ydk-gen (#364)
Add details of how to use ydk-gen (#364)

* Update README.md

* Update README.md

* Update README.md

CiscoDevNet/ydk-gen,CiscoDevNet/ydk-gen,CiscoDevNet/ydk-gen,CiscoDevNet/ydk-gen,psykokwak4/ydk-gen,psykokwak4/ydk-gen,psykokwak4/ydk-gen,psykokwak4/ydk-gen,CiscoDevNet/ydk-gen,psykokwak4/ydk-gen,CiscoDevNet/ydk-gen