create DEVELOPMENT_MAINTENANCE.md documentation
Feature Request
Why
as part of this epic big-bang&289 we are auditing the DEVELOPMENT_MAINTENANCE.md documents within all of our packages, while the tools packages are different than the standard Big Bang deploy-able packages, a need for a guide on how to development and maintain this tool would be helpful.
Proposed Solution
create a docs/DEVELOPMENT_MAINTENANCE.md document that outlines the standards, tips/tricks of developing this tool and how to test/run this tool