#355 Initial test setup with an example

Created by: tannakartikey

Description of PR Initial test setup with one example. Include the following thing:

• Added @testing-library/jest-dom, @testing-library/react and extended Jest expect inside setupTests.js
• Example test for Level component
• GitHub action to run the specs on each PR and the commit

Type of PR

• Bugfix
• New feature

Relevant Issues
#355 (closed)

Checklist

• Compiles and passes lint tests
• Properly formatted
• Tested on desktop
• Tested on phone

Screenshots