Maintain a changelog

[toolswatch]

Kyle,
I noticed the code is being updated 🥇 .. That's awesome !!!

can you add a changelog.md file, just to notify what changes you've done so far. I was unable to see what was added in indicator.py without digging into diffs :)

Anyway, great job !!!!!!

[simulationKYLE]

Created a Changelog.md file. Tried to remember all the significant changes and added them. Thanks for the suggestion!