Add notification service example to Factory Method README

[shabinfrancis]

Pull Request Template

What does this PR do?

Adds a new real-world example to the Factory Method pattern documentation.
The example uses a notification system to help readers understand how the Factory Method pattern can be used to create different notification services while keeping the client independent of concrete implementations.

[github-actions]

PR Summary

Adds a real-world example to the Factory Method pattern documentation, showing how a notification system can create Email, SMS, or Push notification services via the Factory Method while keeping the client independent of concrete implementations.

Changes

File	Summary
factory-method/README.md	Inserted a real-world example describing a messaging app that can send Email, SMS, or Push notifications. The Factory Method selects and creates the correct notification service, demonstrating client decoupling from concrete implementations.

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autogenerated by presubmit.ai

[github-actions]

✅ LGTM!

Review Summary

Commits Considered (1)

• acaf94c: Add notification service example to Factory Method README

Files Processed (1)

• factory-method/README.md (1 hunk)

Actionable Comments (0)

Skipped Comments (1)

• factory-method/README.md [34-36]

  readability: "Improve README blockquote formatting and wording"

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.23%. Comparing base (3b9a2df) to head (acaf94c).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3515      +/-   ##
============================================
- Coverage     83.30%   83.23%   -0.08%     
+ Complexity     4025     4020       -5     
============================================
  Files          1060     1060              
  Lines         14246    14246              
  Branches        686      686              
============================================
- Hits          11867    11857      -10     
- Misses         2094     2100       +6     
- Partials        285      289       +4     

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