merge cmd

[ozankasikci]

• add merge commend
• update: src/commands/merge/mod.rs

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.75%. Comparing base (adfc4d1) to head (6c4ef8b).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #8      +/-   ##
==========================================
+ Coverage   92.30%   92.75%   +0.45%     
==========================================
  Files           9        9              
  Lines        1767     1877     +110     
==========================================
+ Hits         1631     1741     +110     
  Misses        136      136              

Flag	Coverage Δ
unit	92.75% <100.00%> (+0.45%)	⬆️

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