fix(build, readme): relax engine requirement, gitignore

[cdcabrera]

What's included

• fix(build, readme): relax engine requirement, gitignore
  • build, relax the engine requirement
  • readme, gitignore basics for default generated .docs directory

Updates issue/story

updates #13

[codecov-io]

Codecov Report

Merging #16 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #16   +/-   ##
=======================================
  Coverage   69.33%   69.33%           
=======================================
  Files           5        5           
  Lines         212      212           
  Branches       59       59           
=======================================
  Hits          147      147           
  Misses         52       52           
  Partials       13       13

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