Issue/improve unit testing setup

[onefloid]

Description

To run the unit tests, you need to customize Tests/config.ini. Since this file is versioned with Git, it ends up in a unclean working directory with changes you don't want to commit. I suggest including only a template file in the repository Tests/config.ini.template

Changes

This pull request includes:

• Introducing the Tests/config.ini.template file and adding Tests/config.ini to .gitignore
• Updated the documentation on how to create the file config.ini.
• Updated the documentation on how to run the test from the command line

Does it include Breaking Changes?

This PR shouldn't break anything as long as nobody relies on the currently saved config.ini If so, it would be very bad pratice
For people who have overwritten the config.ini locally, a git pull would fail as long as the working directory includes the modified config.ini

[MariusWirtz]

Nice contribution. I agree with your ideas re the config.ini

Thank you @onefloid.