feat(#141): Created better tests structure

[Hiccup-za]

GitHub Issue: https://github.com/mjovanc/njord/issues/141

Changes

• Created the sqlite folder & split tests out into separate test files
• Addressed all warnings within test files
• Updated the README with a Testing section

Let me know what you think!

Testing

All tests:

All tests within sqlite folder:

A specific test within the sqlite folder:

[vercel[bot]]

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[mjovanc]

Also add this to the contributors section in README.md:

[<img src="https://github.com/Hiccup-za.png?size=72" alt="Hiccup-za" width="72">](https://github.com/Hiccup-za)

[mjovanc]

Also, add "Testing" to the TOC in README.md.

[mjovanc]

LGTM!