[PROJECT HEALTH] Set Up git ignore - Backend

[misslame]

User Story

As a project developer, I should be prevented from uploading files unnecessary for the project that should remain localized so that I do not impact the project's quality and disrupt fellow project contributors and their local dev environments.

Technical Task:

Git ignore properly ignoring files that should not be pushed to the project repository. https://github.com/atlassian/docker/blob/master/.gitignore example of docker ignore https://github.com/google/mysql/blob/master/.gitignore example of MySQL ignore https://github.com/github/gitignore/blob/main/Node.gitignore of a node git ignore

Acceptance Criteria:

• have a git ignore that ignores common 'dummy' files specific to the backend.
• This includes all need-to-be ignored files for docker, MySQL, and node.