Volumes persistence for Airbyte

I posted a [message on Airbyte's Slack](https://airbytehq.slack.com/archives/C019WJFR1JT/p1607381318105500) about this because it isn't well documented except this mention [here](https://github.com/airbytehq/airbyte/blob/master/docs/contributing-to-airbyte/developing-locally.md)

Update : [Link to Doc about it](https://docs.airbyte.io/tutorials/airbyte-config-persistencel)