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

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

Sam Warner 8430996488 collatz-conjecture: add start implementation. (#1021) * collatz-conjecture: add start implementation. * collatz-conjecture: update with @FridaTveit 's suggestion		8 lat temu
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main/java	collatz-conjecture: add start implementation. (#1021)	8 lat temu
test/java	Move test version data to .meta dir	9 lat temu