Add Java implementation

[nowshad-hasan]

I've added Java implementation with some customization:

1. To get strings by type. Anyone can pass NaughtyStrings.ALL to get all the naughty strings. List<String> naughtyStringList = BLNS.getList(NaughtyStrings.RESERVED_STRINGS);

2. To get a customisable list of any preferred type. Anyone can pass NaughtyStrings.ALL to get a fixed-size list from all strings. List<String> randomNaughtyStringList = BLNS.getRandomList(10, NaughtyStrings.NUMERIC_STRINGS);