Set Up Continuous Integration with GitHub Actions

[niveditashankaranarayanan]

As a Developer I need continuous integration to automatically test the code on every pull request.
So that I can ensure code quality and prevent broken builds from being merged.

Details and Assumptions

• GitHub Actions should run unit tests, linting, and code coverage checks.

• Add build status and code coverage badges to the README.md file.

  Acceptance Criteria

Given a pull request is submitted
When GitHub Actions run
Then the unit tests, linting, and code coverage checks should pass.