Fix syntax errors and refactor duplicate prints in Example.java

[Copilot]

Example.java had multiple syntax errors preventing compilation, plus 10 identical println statements that should be a loop.

Fixes

• publi statc → public static (typos in method signature)
• println("hello world" → println("hello world") (missing closing paren)
• println("hello world") → println("hello world"); (missing semicolon)

Refactor

Replaced 10 duplicate println calls with a for loop:

// Before: 10 identical lines
System.out.println("hello world";   // also broken
System.out.println("hello world")   // also broken
System.out.println("hello world");
// ...7 more

// After
for (int i = 0; i < 10; i++) {
    System.out.println("hello world");
}

Also added .gitignore to exclude compiled *.class artifacts.

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