Added an example showing programmatic usuage of sync-db Node/JS

[parwatcodes]

Resolves #12

• Added sync-db.js file which loads sync-db.yml, resolves connections and synchronizes.
• sync-db script now loads sync-db.js.

[codecov-io]

Codecov Report

Merging #29 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #29   +/-   ##
======================================
  Coverage    22.9%   22.9%           
======================================
  Files          11      11           
  Lines         179     179           
  Branches       11      11           
======================================
  Hits           41      41           
  Misses        137     137           
  Partials        1       1

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[kabirbaidhya]

@p0k8h Looks like your branch isn't up to date. I still see changes that've gone to master.

[kabirbaidhya]

Also update the main README file.