Fixes missing eager/lazy initialization examples for Hacktoberfest co…

[Th-Shivam]

feat: Add eager and lazy initialization examples for Singleton pattern

• Add EagerInitializedSingleton with class loading time initialization
• Add LazyInitializedSingleton with synchronized lazy loading
• Update App.java to demonstrate both approaches with clear logging
• Update README.md with comprehensive documentation for all singleton types
• Add corresponding unit tests for both implementations
• All tests passing (21/21)

[github-actions]

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Analyzing changes from base (ede37bd) to latest commit (1cfbf30):

• 1cfbf30: Fixes missing eager/lazy initialization examples for Hacktoberfest contributors

📁 Files being considered (6)

🔄 singleton/README.md (2 hunks)
🔄 singleton/src/main/java/com/iluwatar/singleton/App.java (1 hunk)
➕ singleton/src/main/java/com/iluwatar/singleton/EagerInitializedSingleton.java (1 hunk)
➕ singleton/src/main/java/com/iluwatar/singleton/LazyInitializedSingleton.java (1 hunk)
➕ singleton/src/test/java/com/iluwatar/singleton/EagerInitializedSingletonTest.java (1 hunk)
➕ singleton/src/test/java/com/iluwatar/singleton/LazyInitializedSingletonTest.java (1 hunk)

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