docs(readme): update README with unit test info, CI, and clean repo 📚

[NeaByteLab]

Summary

• Updated README.md with unit test information, usage instructions, and CI integration badge.
• Added Jest test files for key modules.
• Removed .gitkeep and .keep files to clean the repository.

Details

• README.md documents how to run unit tests and describes the test folder structure.
• Includes test/errorDocPage.test.js, test/sendProblem.test.js, test/sendSuccess.test.js using Jest and node-mocks-http.
• Added .github/workflows/test.yml for CI automation.
• Cleaned up unused .gitkeep / .keep placeholders.

Next Steps

• Monitor CI build status on GitHub.
• Add more tests if needed.
• Proceed with feature development.

[Copilot]

Pull Request Overview

This PR integrates unit testing into the project by adding Jest-based tests for key modules, updates CI to run those tests automatically, and refreshes documentation to reflect these changes.

• Introduce Jest tests for sendSuccess, sendProblem, and errorDocPage
• Add a GitHub Actions workflow (.github/workflows/test.yml) to run tests on push/PR
• Update package.json scripts/devDependencies and refresh README.md with testing and CI instructions

Reviewed Changes

Copilot reviewed 6 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/sendSuccess.test.js	New unit test for the sendSuccess helper
test/sendProblem.test.js	New unit test for the sendProblem helper
test/errorDocPage.test.js	New unit tests for the errorDocPage middleware
package.json	Added test script and moved Jest/node-mocks-http into devDependencies
README.md	Added CI badge, test instructions, and updated usage
.github/workflows/test.yml	New CI workflow to install dependencies and run tests

Comments suppressed due to low confidence (3)

test/sendSuccess.test.js:7

• Consider adding an assertion that the response Content-Type header is set to application/json to ensure your helper sets the correct content type.

  const data = response._getJSONData()

test/sendProblem.test.js:7

• You may want to assert response.getHeader('Content-Type') matches application/json so the error helper properly sets the content type header.

  const data = response._getJSONData()

README.md:61

• There's an extra # in this inline comment – consider reducing to a single # for clarity (e.g., npm start # start the server).

npm start  # # start the server