docs: add real-world example to Observer pattern README #3376
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What has been done
Added a new "Real-World Example" section to the Observer pattern README file.
Why this change
To provide a practical explanation of how the Observer pattern is applied in modern Java applications,
helping readers better understand its use in real projects.
How to test
Open the file
observer/README.md
and verify that the new section appears at the end of the document.Hacktoberfest contribution 🎃