[FEATURE] Add GitHub Action for automated testing

[rohitkumarnaidu]

[Program]

ELUSOC

[Description]

Set up a CI workflow that runs npm test on every pull request to maintain code quality.

[Contributor Checklist]

• I am participating via ELUSOC
• I have read the contribution guidelines
• I checked for existing issues before creating this

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Please assign this issue to me.

[rohitkumarnaidu]

Hey maintainer, I'd love to work on this issue and submit a PR. Could you please assign it to me?

[rohitkumarnaidu]

Hey maintainer, I'd love to work on this issue and submit a PR. Could you please assign it to me?

[rohitkumarnaidu]

Closing - the repo already has CI workflows set up. My mistake for not checking first. Sorry about that!