Create init command and quiet option

[alexcanessa]

• Add gren init command to help to configure the module. Resolves Create module initialisation panel #83
• Add --quiet option. Resolves Create a silent mode #108
• Add --debug option, which now outputs the options

[codecov-io]

Codecov Report

Merging #123 into master will increase coverage by 1.23%.
The diff coverage is 80.95%.

@@            Coverage Diff             @@
##           master     #123      +/-   ##
==========================================
+ Coverage   84.66%   85.89%   +1.23%     
==========================================
  Files           7        7              
  Lines         300      312      +12     
==========================================
+ Hits          254      268      +14     
+ Misses         46       44       -2

Impacted Files	Coverage Δ
lib/_options.js	71.42% <ø> (ø)	⬆️
lib/src/_utils.js	100% <100%> (ø)	⬆️
lib/src/Gren.js	83.78% <33.33%> (+0.98%)	⬆️

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