solves issue #129

[suryanshgargbpgc]

1. Adds Github actions workflow similar to https://github.com/projectmesa/mesa/blob/main/.github/workflows/benchmarks.yml
2. Documentation added (benchmark.md) 3.updated mkdocs.yml to include new documentation in the navigation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #130   +/-   ##
=======================================
  Coverage        ?   91.29%           
=======================================
  Files           ?       14           
  Lines           ?     2217           
  Branches        ?        0           
=======================================
  Hits            ?     2024           
  Misses          ?      193           
  Partials        ?        0           

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