Create CONTRIBUTING.md for project contribution guidelines

Added a comprehensive contributing guide to assist new contributors.

Author: Ronit049

CONTRIBUTING.md

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+# 🤝 Contributing Guide
+
+Thank you for your interest in contributing to the **Blinkit Store Placement Prediction Project**!  
+We welcome contributions from everyone—whether you're fixing bugs, improving documentation, or adding new features.
+
+---
+
+## 📌 Table of Contents
+- [How to Contribute](#how-to-contribute)
+- [Project Setup](#project-setup)
+- [Branching Strategy](#branching-strategy)
+- [Commit Guidelines](#commit-guidelines)
+- [Pull Request Process](#pull-request-process)
+- [Code Style Guidelines](#code-style-guidelines)
+- [Reporting Issues](#reporting-issues)
+- [Feature Requests](#feature-requests)
+
+---
+
+## 🚀 How to Contribute
+
+You can contribute in multiple ways:
+- 🐛 Fix bugs
+- ✨ Add new features
+- 📊 Improve model performance
+- 📝 Enhance documentation
+- 🧪 Add test cases
+
+---
+
+## ⚙️ Project Setup
+
+1. **Fork the repository**
+2. **Clone your fork**
+   ```bash
+   git clone https://github.com/your-username/BLINKIT-store-placement-prediction-project.git
+   cd BLINKIT-store-placement-prediction-project
+   ```
+   Create a virtual environment (recommended)
+
+python -m venv venv
+source venv/bin/activate  # On Windows: venv\Scripts\activate
+
+Install dependencies
+
+pip install -r requirements.txt
+🌿 Branching Strategy
+main → stable code
+dev → development branch
+feature branches → feature/your-feature-name
+bug fixes → fix/issue-name
+
+Example:
+
+git checkout -b feature/improve-model-accuracy
+📝 Commit Guidelines
+
+Write clear and meaningful commit messages:
+```
+feat: add new feature for store clustering
+fix: resolve missing value handling bug
+docs: update README and contributing guide
+```
+🔄 Pull Request Process
+Ensure your code runs without errors
+Update documentation if needed
+Commit your changes
+
+Push to your fork:
+```
+git push origin feature/your-feature-name
+```
+Open a Pull Request (PR)
+✅ PR Checklist:
+ Code is clean and well-structured
+ No unnecessary files included
+ Proper comments added
+ Tested locally
+🧑‍💻 Code Style Guidelines
+Follow PEP 8 (Python style guide)
+Use meaningful variable names
+Add comments where necessary
+Keep functions modular and readable
+
+Example:
+```
+def predict_store_location(data):
+    """Predict optimal store placement based on input features."""
+    pass
+```
+🐞 Reporting Issues
+
+If you find a bug:
+
+Clearly describe the issue
+Include steps to reproduce
+Add screenshots (if applicable)
+Mention expected vs actual behavior
+
+💡 Feature Requests
+
+Have an idea? Open an issue with:
+
+Feature description
+Why it’s useful
+Possible implementation approach
+🙌 Contribution Tips
+Start with small issues if you're a beginner
+Read the codebase before making changes
+Ask questions in issues/discussions
+
+⭐ Support
+
+If you like this project:
+
+⭐ Star the repo
+🍴 Fork it
+📢 Share it
+
+Happy Coding! 🚀