add algorithms to detect cycle in graph

[Zzocker]

Description

Add algorithms to detect cycles in directed and undirected graphs using both bfs and dfs traversal

Type of change

• New feature (add algorithms to detect cycle in graph)

Checklist:

• I ran bellow commands using the latest version of rust nightly.
• I ran cargo clippy --all -- -D warnings just before my last commit and fixed any issue that was found.
• I ran cargo fmt just before my last commit.
• I ran cargo test just before my last commit and all tests passed.
• I added my algorithm to the corresponding mod.rs file within its own folder, and in any parent folder(s).
• I added my algorithm to DIRECTORY.md with the correct link.
• I checked COUNTRIBUTING.md and my code follows its guidelines.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.85%. Comparing base (87673f0) to head (0f7c196).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #721      +/-   ##
==========================================
+ Coverage   94.80%   94.85%   +0.05%     
==========================================
  Files         301      302       +1     
  Lines       22356    22575     +219     
==========================================
+ Hits        21195    21414     +219     
  Misses       1161     1161              

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