Add Mock server

[Baptouuuu]

Closes #22

[codecov]

Codecov Report

❌ Patch coverage is 97.56839% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.47%. Comparing base (06190b2) to head (8c8b767).
⚠️ Report is 10 commits behind head on develop.

Files with missing lines	Patch %	Lines
tests/Servers/MockTest.php	96.75%	14 Missing ⚠️
src/Servers/Mock/Actions.php	94.44%	1 Missing ⚠️
src/Servers/Mock/ProcessBuilder.php	97.05%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop      #23      +/-   ##
=============================================
+ Coverage      97.19%   97.47%   +0.27%     
- Complexity       310      429     +119     
=============================================
  Files             56       68      +12     
  Lines           2070     2728     +658     
=============================================
+ Hits            2012     2659     +647     
- Misses            58       69      +11     

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