Initialize Jest

[joshgamache]

Dev Story: I want Jest to be set up because it will be needed for frontend client NodeJS testing and this will help me to ensure the frontend can be tested.

Acceptance criteria:

1. Jest runs locally
2. Sample test passes

Consideration and notes

• See Test: jest config and first test by BCerki · Pull Request #201 · bcgov/cas-registration (github.com) for Cas-reg execution

Tasks

• [x] Jest configured in line with cas-reg
• [x] Write a sample test