Proposed Rubocop config file

If curious about the settings and you can't find it (some are hard to
discover) you can toggle from true/false and run `rubocop` to see the
effect.
Made some changes to turn off Style Enforcement

To examine, in your local file system, search for 'rubocop'
Style Guide tool info in README

re: exercism/xruby#69 and exercism/xruby#25
Visual (dyslexic style) Typo corrected.

Re: exercism/xruby#69
Merge pull request #69 from kotp/Rubocop

Rubocop Sample config file and exempted cops in existing code