Add how-to Guide for Postgres operators

[kaxil]

Description

A guide that describes how to use all the operators for Postgres (https://github.com/apache/airflow/tree/master/airflow/providers/postgres) would be useful.

Other guides are available:
https://airflow.readthedocs.io/en/latest/howto/operator/index.html

Source code for those guides are at:
https://github.com/apache/airflow/tree/master/docs/howto/operator

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Best regards,
Kaxil

[sunnygupta05]

Hey @kaxil Can you please assign this to me. May be a good start to become a open source committer. Thank you for opportunity.

[eladkal]

@sunnygupta05 assigned to you