Add TOTP support

[D-VR]

I have added TOTP support and some error handling.

Might have missed something though, so feel free to give feedback / test it out.

Closes #118

[D-VR]

Don't know why the check is failing, the [ is matched.

[ the ](error: cannot format /home/runner/work/syncMyMoodle/syncMyMoodle/syncmymoodle/__main__.py: cannot use --safe with this file; failed to parse source file AST: f-string: unmatched '[' (<unknown>, line 250))

Edit: it's because of nested double quotes! Adding fix.

[Romern]

Thank you!