Add Icons for Testing Types and Tools

[gooddevil79]

These icons would help enhance the visual categorization within our project, making it easier to navigate through different testing topics and tools.

Icons we would love to see included:

Playwright: An icon representing Playwright, specifically for end-to-end testing.
Vitest: An icon for Vitest, highlighting unit testing capabilities.
E2E Testing: A generic icon for end-to-end testing.
Unit Testing: An icon for unit testing.
Integration Testing: An icon representing integration testing.
CucumberJS: An icon for BDD and Cucumber testing.
Mocking/Stubbing: Icons for mocking and stubbing techniques.
If you have any additional suggestions or other testing-related icons you feel would be useful, we are more than happy to consider them.

thank you.