Remove .pyc and .DS_Store files, and add these to .gitignore

[ageron]

Great project, thanks!

Here's a PR to remove the compiled Python files (*.pyc) and .DS_Store files, which should generally not be added to a git repository. I also added a .gitignore file to ignore these files in the future (as well as a few other file types that you generally do not want to add to a git repo).

Hope this helps.