Add optional parameter `$duration` to `CookieLogin::addCookie()`

[vjik]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌
Fixed issues	#85

[what-the-diff[bot]]

PR Summary

• Update on Documentation Added an entry in the CHANGELOG.md to keep track of the introduction of an optional parameter in the CookieLogin::addCookie() method.

• Improvement of Project Setup Instructions The required command for setting up the project using Composer, as provided in the README.md, has been updated for better accuracy.

• Increased Flexibility in Cookie Handling An optional parameter $duration has been added to the CookieLogin::addCookie() method in the CookieLogin.php file. This allows cookies to be set with a custom duration without affecting previous functionalities.

• Enhanced Test Coverage A new test scenario has been added in the CookieLoginTest.php file for the testAddCookieWithCustomDuration() method. This test ensures that new cookies with custom durations are being added accurately. This contributes to the reliability and stability of the solution.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (cb4704e) 87.31% compared to head (a6e5134) 87.36%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #86 +/- ## ============================================ + Coverage 87.31% 87.36% +0.04% - Complexity 97 98 +1 ============================================ Files 13 13 Lines 268 269 +1 ============================================ + Hits 234 235 +1 Misses 34 34 ```

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[samdark]

👍