Add advanced example source code

[sairoutine]

Hi!
From #14, I think it's difficult to understand advanced example in readme.

So that I wrote a working advanced example.

Thanks.

[codecov-io]

Codecov Report

Merging #15 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #15   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           2      2           
  Lines         104    104           
=====================================
  Hits          104    104

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