docs: add technical documentation (DOCS.md)

DOCS.md

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+# Technical Documentation
+
+## Project Name
+Open-Source-Todo
+
+## Description
+A web-based Todo application built using HTML, CSS, JavaScript, and Node.js with Express.
+
+## Architecture Overview
+The application follows a simple client-server architecture:
+
+- Frontend: HTML, CSS, JavaScript
+- Backend: Node.js with Express
+- Data Handling: LocalStorage (future database integration possible)
+
+## Folder Structure
+public/
+├── index.html
+├── styles.css
+└── script.js
+
+server.js
+
+## Core Features
+- Add Task
+- Delete Task
+- Toggle Task Completion
+- Persistent Storage using LocalStorage
+- Responsive UI
+
+## API Routes (If Applicable)
+/api/tasks  
+GET – Fetch all tasks  
+POST – Create a task  
+PUT – Update a task  
+DELETE – Delete a task  
+
+## Contribution Guidelines
+- Follow branch naming conventions
+- Use clear commit messages
+- Submit Pull Requests for review
+- Do not merge directly to main
+
+## License
+MIT License