Add comprehensive README.md documentation for Calculator project

[Copilot]

Overview

This PR adds a comprehensive README.md file to document the Calculator project. The previous README contained only a title ("# Calculator"), which provided no useful information for users or developers wanting to understand, install, or contribute to the project.

Changes

The new README.md includes all essential documentation sections:

• Title and Description: Clear introduction describing this as a GUI-based calculator built with Python and Kivy
• Features: Highlights 7 key capabilities including interactive GUI interface, basic arithmetic operations, decimal support, error handling, and cross-platform compatibility
• Requirements: Lists Python 3.6+ and Kivy 2.0.0+ with links to detailed installation guides
• Installation: Step-by-step instructions for cloning the repository and installing dependencies
• Usage: Command examples showing how to run the application (python Calculator.py) with detailed usage instructions and example calculations
• Project Structure: Visual overview of the repository structure and code architecture
• Tests: Manual testing guidance with a comprehensive testing checklist
• Contributing: Complete contribution workflow with 5 steps and ideas for future enhancements
• License: Open source licensing information
• Contact: Repository and issue tracker links for support

Example

Users can now quickly get started with clear instructions:

# Clone and setup
git clone https://github.com/phantomop26/Calculator.git
cd Calculator
pip install kivy

# Run the calculator
python Calculator.py

The README accurately reflects the Kivy-based GUI nature of the application and provides all information needed for users to install, run, and contribute to the project.

Impact

• Improved developer onboarding experience
• Clear documentation for new users
• Established contribution guidelines
• Professional project presentation

Original prompt

Add a new file README.md at the repository root that documents the Calculator project. The README should be a clear, concise, and actionable guide for developers and users. Include the following sections: Title, Short description, Features, Requirements, Installation, Usage (command examples), Project structure, Tests, Contributing, License and Contact. Tailor wording for a Python CLI/calculation project. Use Markdown. Provide the exact README contents in the problem statement so the PR can add the new file. Do not include any secrets or binary files. Place the README at README.md and open a pull request against the default branch.

This pull request was created as a result of the following prompt from Copilot chat.

Add a new file README.md at the repository root that documents the Calculator project. The README should be a clear, concise, and actionable guide for developers and users. Include the following sections: Title, Short description, Features, Requirements, Installation, Usage (command examples), Project structure, Tests, Contributing, License and Contact. Tailor wording for a Python CLI/calculation project. Use Markdown. Provide the exact README contents in the problem statement so the PR can add the new file. Do not include any secrets or binary files. Place the README at README.md and open a pull request against the default branch.

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