Add project README with overview and usage

README.md

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+## Python Programs Collection
+
+This repository contains a collection of beginner-friendly Python scripts covering basic programming concepts (input/output, conditionals, loops, functions, simple games, and small utilities). It is suitable for learners practicing Python fundamentals and for contributors making incremental improvements.
+
+### Structure
+- `Python-Programs/`: Individual standalone scripts. Many are interactive and can be run directly with Python 3.
+
+### How to Run
+Use Python 3.10+.
+
+Run any script from the project root or from within the `Python-Programs` directory, for example:
+
+```bash
+cd Python-Programs
+python3 "Basic Calculator Operartion.py"
+```
+
+Some scripts accept command-line arguments. For example, the workout timer:
+
+```bash
+python3 "Workout Timer.py" --seconds 10
+```
+
+### Recently Improved Scripts
+- `Basic Calculator Operartion.py`: Refactored into reusable functions with input validation and an optional CLI.
+- `rock-paper-scissors.py`: Fixed game loop, added input validation, replay support, and clearer prompts.
+- `Workout Timer.py`: Added `argparse` support, countdown behavior with one-second intervals, and clearer output.
+
+### Contributing
+Contributions are welcome! Ideas:
+- Improve input validation and error handling in scripts
+- Add documentation or usage examples to script headers
+- Convert interactive scripts to also support command-line flags via `argparse`
+- Add small, self-contained new programs demonstrating Python basics
+
+Please keep changes focused and well-documented. For any script you modify, try to:
+- Preserve existing behavior where reasonable
+- Add helpful prompts and messages
+- Guard execution with `if __name__ == "__main__":` when adding functions
+
+### License
+If not specified elsewhere, contributions are provided under the MIT license.
+
+