add an example client

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 69.17%. Comparing base (3188653) to head (1ba981a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #28 +/- ## ======================================= Coverage 69.17% 69.17% ======================================= Files 3 3 Lines 266 266 ======================================= Hits 184 184 Misses 57 57 Partials 25 25 ```

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