[#43] Update repo structure to https://github.com/AlexSkrypnyk/scaffold

[tannguyen04]

#43

• I have formatted the subject to include ticket number
  as [#123] Verb in past tense with dot at the end.
• I have added a link to the issue tracker
• I have provided information in Changed section about WHY something was
  done if this was not a normal implementation
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• I have run new and existing relevant tests locally with my changes, and
  they passed
• I have provided screenshots, where applicable

[tannguyen04]

Because I update phpunit to 10, we need to create abstract class without suffix Test.

[tannguyen04]

PHPunit 10 does not have PHPUnit\Framework\Error\Error.
I created this class to solve the missing class issue.