Add sample operations

[srmnitc]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 14.95327% with 273 lines in your changes are missing coverage. Please review.

Project coverage is 63.25%. Comparing base (714910f) to head (4ff1e67).

Files	Patch %	Lines
atomrdf/graph.py	8.69%	126 Missing ⚠️
atomrdf/sample.py	11.40%	101 Missing ⚠️
atomrdf/visualize.py	11.11%	32 Missing ⚠️
atomrdf/structure.py	53.33%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #111      +/-   ##
==========================================
- Coverage   69.39%   63.25%   -6.15%     
==========================================
  Files          20       20              
  Lines        2418     2713     +295     
==========================================
+ Hits         1678     1716      +38     
- Misses        740      997     +257     

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