macOS support (issue #5)

[nkhlmn]

PR Check list

• [x] I am pulling from my own branch and not a master branch
• [x] Commit messages are detailed and reference file(s) changed
• [x] If applicable, I am referencing or closing an open issue: ref #5

Pull Request Description

Just added support for macOS using some native system calls. macOS doesn't play .oga files natively so I converted your sound file to .aiff and added it to src/sounds/

[bbenefield89]

This looks great @nikhilkamineni thanks for your help :100: