0.1.0 Airflow Helper initial release

**Airflow Helper** is a tool that currently allows setting up Airflow Variables, Connections, and Pools from a YAML configuration file. Support yaml inheritance & can obtain all settings from existed Airflow Server!

You can use it as command line tool, from docker container (https://hub.docker.com/repository/docker/xnuinside/airflow-helper/) or in pure Python code.

Enjoy!