This PR adds runnable JavaScript examples with a test harness to help developers better understand the core concepts.

What's included:

• Newexamples/ folder with concise, runnable code examples
• Test harness supporting both sync and async tests
• Individual test files for each example
• Updated README and package.json with examples info
• All tests passing (7/7)

Examples demonstrate:

• Call stack behavior (LIFO order)
• Primitives vs references (value vs reference types)
• Closures (lexical scope)
• Map/filter/reduce array operations
• Event loop (macro vs microtasks)
• This/call/bind behavior
• Promises/async/await patterns

How to use:

Run a single example:

node examples/event-loop.js# or any other example

Run all tests:

npmtest

Each example is self-contained and includes expected output in comments.