Add StubCsrfToken

[hacan359]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌
Fixed issues

[what-the-diff]

PR Summary

• Introduction of StubCsrfToken.php
  A new file, StubCsrfToken.php, has been introduced. This file contains an easy-to-use implementation of the CsrfTokenInterface, designed to help in testing or act as a placeholder during development.

• Inclusion of StubCsrfTokenTest.php
  Along with the above file, we have also added StubCsrfTokenTest.php. This is a dedicated test file for our new StubCsrfToken class. Its purpose is to ensure the correct functioning of StubCsrfToken.

• Improvements in README.md
  The README.md document has been revised with several enhancements, such as:

  • Formatting the list of supported algorithms for better readability.
  • Adding details about the new StubCsrfToken class and its uses.
  • Revising the license section for clarity and presentation.
    In overall, the changes in README.md contribute to a more user-friendly documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4124294) 100.00% compared to head (4dec69e) 100.00%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##              master       #53   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity        43        47    +4     
===========================================
  Files              7         8    +1     
  Lines            120       128    +8     
===========================================
+ Hits             120       128    +8     

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