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

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

Brandon Kiefer 3eb6e52192 reverse-string: add argument to initial solution (#1070) * changed initial reverse string stub to include argument * change reverse string initial solution argument to match ref solution		8 lat temu
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main/java	reverse-string: add argument to initial solution (#1070)	8 lat temu
test/java	added reverse string exercise to track	8 lat temu