add Spotless + Maven wrapper

[ccudennec-otto]

fixes #245

[UrielCh]

you can now commit the formatted code, to the github action will be happy.

[ccudennec-otto]

you can now commit the formatted code, to the github action will be happy.

Done 🙂

I used "googleJavaFormat" in the default configuration which resulted in quite a lot of changes. Can you review the new formatting if that's good enough or if I should apply changes to the formatter configuration?

From my personal experience, the main benefit of having a code formatter is that you don't need to worry about the formatting anymore - even if the formatter sometimes might not 100% match the personal taste. Feel free to suggest some configuration changes to make the codestyle match your taste. 🙂 Compare the official documentation to get some ideas.

You can apply formatting changes by executing ./mvnw spotless:apply. Should this be mentioned in the README.md?

Cheers,

Christopher

[UrielCh]

I'm reading the codebase.

I'm surprise to see a forgotten import java.util.*; in my code base.
the tab are replaced by 2 space.
....

LGTM