Exercise setups requires global credentials

[TidosDK]

When running the setup script in exercises that perform git commits, credentials must be defined. If the user hasn't defined global credentials, it won't be able to commit anything.

To produce the bug, the bisect exercise can be initialized.

The solution would be to define dummy credentials as the repository won't be using the credentials anyway.

[TidosDK]

Example solution would be to add the following in the setup.sh and setup.ps1 script.

git config user.name "eficode"
git config user.email "eficode@example.com"