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

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

morrme 16b0a783a7 luhn: add hints to @Ignore annotations		9 lat temu
..
example/java	luhn: update to latest canonical tests	9 lat temu
main/java	[#89] Move problems under "exercises" dir	10 lat temu
test/java	luhn: add hints to @Ignore annotations	9 lat temu