Contribute Setup Instructions

[AnthonyGaruccio]

Can you provide us with a description of your development environment?

I was having issues getting tox to run through the tests on both my M1 MacOs device so I tried to set up a docker container to develop in #295

[francoisfreitag]

From the Installation part of the documentation, OpenLDAP libraries are required. See https://www.python-ldap.org/en/python-ldap-3.3.0/installing.html#build-prerequisites for more details per distribution.