kristofer/JavaExercism: lots of exercises in java... from https://github.com/exercism/java

lots of exercises in java... from https://github.com/exercism/java

vivshaw a46b616860 remove final from class declaration in luhn exercise		9 lat temu
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example/java	luhn: update to latest canonical tests	9 lat temu
main/java	remove final from class declaration in luhn exercise	9 lat temu
test/java	luhn: add hints to @Ignore annotations	9 lat temu