Add a changelog

[tsjohns9]

Is your feature request related to a problem? Please describe.
A changelog has not been added to the project. Adding a changelog with a list of all the items that changed for a new release will help document what is being added to the project, and it will also help identify any breaking changes.

Describe the solution you'd like

• Add a CHANGELOG.md file.
• Add automation to the pipeline so that when a commit is added to main, the changelog is automatically updated to reflect what that change is.
• Consider a commit message format to easily identify what the change is, and who made it.