Reverted README back to current and appended new testing

[kelmryan]

Reverted back to the current main branch.

• Appended new tests
• Left TOC alone

[danieldanielecki]

@kelmryan, fabolous contribution.

Before I'll merge, might you please:

• Change 2 lines of break to 1 line of break wherever needed,
• Make sure questions are in 1 line (we need it badly for automation tools),
• Make sure new lines are added between question and first answer,
• Remove duplicated Back to Top - it looks like it's just 1 I marked,
• Remove notes to documentation/links/resources.

Thanks a million!

[danieldanielecki]

will address the findings in a separate commit by myself

[danieldanielecki]

@GatienBoquet, you could also check for some improvements here, in my comments. After @kelmryan's PR there are still some improvements I find.

Let me know if you could align it, I'd then make a final check after.

[danieldanielecki]

Most fixes in https://github.com/Ditectrev/AWS-Certified-Solutions-Architect-Associate-SAA-C03-Practice-Tests-Exams-Questions-Answers/commit/7b2e887a904351664c89c30bf08b8fee014b7439, will fix last findings while working on #22.