feat(api): support programmatic API

[ybiquitous]

No description provided.

[codecov]

Codecov Report

Merging #21 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #21   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           3      5    +2     
  Lines          36     17   -19     
=====================================
- Hits           36     17   -19

Impacted Files	Coverage Δ
index.js	100% <100%> (ø)
bin/cli.js	100% <100%> (ø)	⬆️
src/select-dir.js	100% <100%> (ø)
src/init.js	100% <0%> (ø)	⬆️

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