Add tests to the project

[nichechristie]

Add test job and workflow to CircleCI configuration, update package.json with test script and jest dependency, and update README with test instructions.

• CircleCI Configuration

  • Add a job to run tests using pnpm test.
  • Add a workflow to run the test job.

• package.json

  • Add a script to run tests using jest.
  • Add jest as a dev dependency.

• README.md

  • Add instructions to run tests using pnpm test.

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