add TypeScript example

[maxbeatty]

add a simple TypeScript example ref #50

[codecov-io]

Codecov Report

Merging #194 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #194   +/-   ##
=======================================
  Coverage   67.87%   67.87%           
=======================================
  Files          12       12           
  Lines         579      579           
=======================================
  Hits          393      393           
  Misses        186      186

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[rauchg]

Thanks a lot @maxbeatty !!