docs: add CONTRIBUTING.md for contributor onboarding

CONTRIBUTING.md

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+# Contributing to Knowte
+
+First off, thank you for considering contributing to Knowte! 🚀
+
+Knowte is an offline-first desktop application designed to transform lecture audio into structured and accessible learning material. Contributions from developers, designers, writers, and open-source enthusiasts help improve the project and make learning more accessible for everyone.
+
+We welcome contributions of all sizes, including:
+- Bug fixes
+- Documentation improvements
+- Feature enhancements
+- UI/UX improvements
+- Performance optimizations
+- Testing and code quality improvements
+
+---
+
+# Table of Contents
+
+- [Getting Started](#getting-started)
+- [Fork and Clone the Repository](#fork-and-clone-the-repository)
+- [Project Setup](#project-setup)
+- [Running the Application](#running-the-application)
+- [Branch Naming Convention](#branch-naming-convention)
+- [Commit Message Guidelines](#commit-message-guidelines)
+- [Coding Standards](#coding-standards)
+- [Pull Request Process](#pull-request-process)
+- [Reporting Issues](#reporting-issues)
+- [Beginner Contribution Workflow](#beginner-contribution-workflow)
+- [Best Practices](#best-practices)
+- [Community Guidelines](#community-guidelines)
+
+---
+
+# Getting Started
+
+Before contributing, please ensure that you:
+
+- Read the project README carefully
+- Check existing issues and pull requests
+- Discuss major changes before implementation
+- Follow the coding and contribution standards
+
+We encourage contributors to start with beginner-friendly issues before moving to advanced tasks.
+
+---
+
+# Fork and Clone the Repository
+
+## 1. Fork the Repository
+
+Click the **Fork** button on the top-right corner of the repository page.
+
+## 2. Clone Your Fork
+
+```bash
+git clone https://github.com/your-username/knowte.git
+cd knowte