Improved observer pattern documentation with use-case explanation

[MADHURI-HS]

Added a real-world explanation for when to use the Observer pattern.

This improves understanding by highlighting its use in event-driven systems where changes in one object need to be reflected in multiple dependent objects.

[github-actions]

PR Summary

Added a real-world explanation for when to apply the Observer pattern, highlighting its role in event-driven systems where a change in one object updates multiple dependents. Also included a database connection example in the Singleton pattern. Updated observer/README.md and singleton/README.md with new usage notes.

Changes

File	Summary
observer/README.md	Adds a real-world, event-driven use-case note to illustrate when to apply the Observer pattern; clarifies its benefits in reflecting changes across dependent objects.
singleton/README.md	Adds a database connection management example to demonstrate a Singleton use-case for ensuring a single shared instance across the application.

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autogenerated by presubmit.ai

[github-actions]

✅ LGTM!

Review Summary

Commits Considered (2)

• f2d8546: Improved observer pattern documentation with use case explaination
• d2a8516: Added database connection example to Singleton pattern

Files Processed (2)

• observer/README.md (1 hunk)
• singleton/README.md (1 hunk)

Actionable Comments (0)

Skipped Comments (2)

• observer/README.md [177-177]

  readability: "Observer: add real-world event-driven use-case"

• singleton/README.md [81-81]

  readability: "Singleton: add database connection use-case"

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud