Add comprehensive README documentation for Calculator Project

[Copilot]

This PR adds complete README documentation for the calculator project, transforming the minimal placeholder into a comprehensive guide for users and contributors.

Changes Made

Created a full-featured README.md that includes:

• Project Overview: Clear introduction describing the calculator application and its purpose
• Features: Detailed list of basic arithmetic operations (addition, subtraction, multiplication, division) and additional functionality like decimal support and error handling
• Getting Started Guide: Prerequisites and step-by-step installation instructions
• Usage Instructions: Clear guide on how to perform calculations with concrete examples
• Project Structure: Outline of the repository organization for future development
• Contributing Guidelines: Complete workflow for contributors including branching strategy, commit conventions, and code style guidelines
• Roadmap: Future enhancements including scientific functions, memory storage, calculation history, keyboard shortcuts, and theme customization
• Contact Information: Maintainer details and repository links
• Acknowledgments: Credits and inspiration section

Impact

This documentation provides:

• A professional first impression for anyone visiting the repository
• Clear guidance for potential contributors
• A roadmap for future development
• Essential information for users wanting to understand and use the calculator

The README is written to be flexible and accommodate different implementation approaches (web-based, desktop, mobile, etc.) as the project evolves.

Original prompt

How's the progress

Conversation Summary

TITLE

Calculator Project README Documentation Request

USER INTENT

The user wants to create a README file to introduce their calculator project.

TASK DESCRIPTION

Create introductory documentation for a calculator project in the form of a README file. The README should provide an overview of the project, its features, and relevant information for users or contributors.

EXISTING

• A calculator project exists (specific implementation details not provided in the conversation)
• The work is being tracked in a pull request

PENDING

• Write the README file content
• The user has asked for a progress update ("How's the progress"), suggesting they are waiting for the README to be created or reviewed

CODE STATE

No specific files or code have been discussed or modified yet. The conversation is in its initial stages.

RELEVANT CODE/DOCUMENTATION SNIPPETS

None provided in the conversation.

OTHER NOTES

• The conversation is very brief and just beginning
• The assistant has acknowledged that work will continue in a pull request
• No specific requirements have been provided yet for what should be included in the README (e.g., installation instructions, usage examples, features list, etc.)
• The user's follow-up question suggests they may be checking on the status of work that should be in progress

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