Improve the README

[cesarsotovalero]

This PR adds a gif to the README which shows the usage of DepClean from the command line.

[codecov]

Codecov Report

Merging #72 (95f00cd) into master (39ab692) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master     #72   +/-   ##
========================================
  Coverage      5.38%   5.38%           
  Complexity       20      20           
========================================
  Files            26      26           
  Lines           966     966           
  Branches        133     133           
========================================
  Hits             52      52           
  Misses          902     902           
  Partials         12      12           

Flag	Coverage Δ	Complexity Δ
unittests	5.38% <ø> (ø)	0.00 <ø> (ø)

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
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