Add new method for ns service

[Smolevich]

closes #35

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (dc21bc7) 72.82% compared to head (8356531) 73.66%.

❗ Current head 8356531 differs from pull request most recent head 4ab413c. Consider uploading reports for the commit 4ab413c to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #36      +/-   ##
============================================
+ Coverage     72.82%   73.66%   +0.83%     
- Complexity      101      102       +1     
============================================
  Files            11       11              
  Lines           471      486      +15     
============================================
+ Hits            343      358      +15     
  Misses          128      128              

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