Improve README onboarding and project overview

[Gingiris]

What changed

• added badges for license, last commit, and stars
• added a table of contents for faster navigation
• expanded the overview to explain why ANOLISA exists and what each component does
• added clearer quick start, source build, repository layout, and docs sections

README optimized with Gingiris README Generator

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

Gingiris Bot seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}