docs: add CONTRIBUTING.md (#1052)

Co-authored-by: sxyazi <sxyazi@gmail.com>

CONTRIBUTING.md

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+# Contributing to Yazi
+
+Thank you for your interest in contributing to Yazi! We welcome contributions in the form of bug reports, feature requests, documentation improvements, and code changes.
+
+This guide will help you understand how to contribute to the project.
+
+## Table of Contents
+
+1. [Getting Started](#getting-started)
+2. [Project Structure](#project-structure)
+3. [Development Setup](#development-setup)
+4. [How to Contribute](#how-to-contribute)
+5. [Pull Request Process](#pull-request-process)
+
+## Getting Started
+
+### Prerequisites
+
+Before you begin, ensure you have met the following requirements:
+
+- Rust installed on your machine. You can download it from [rustup.rs](https://rustup.rs).
+- Familiarity with Git and GitHub.
+
+### Fork the Repository
+
+1. Fork the [Yazi repository](https://github.com/sxyazi/yazi) to your GitHub account.
+2. Clone your fork to your local machine:
+
+   ```sh
+   git clone https://github.com/<your-username>/yazi.git
+   ```
+
+3. Set up the upstream remote:
+   ```sh
+   git remote add upstream https://github.com/sxyazi/yazi.git
+   ```
+
+## Project Structure
+
+A brief overview of the project's structure:
+
+```sh
+yazi/
+├── assets/             # Assets like images and fonts
+├── nix/                # Nix-related configurations
+├── scripts/            # Helper scripts used by CI/CD
+├── snap/               # Snapcraft configuration
+├── yazi-adaptor/       # Yazi image adaptor
+├── yazi-boot/          # Yazi bootstrapper
+├── yazi-cli/           # Yazi command-line interface
+├── yazi-config/        # Yazi configuration file parser
+├── yazi-core/          # Yazi core logic
+├── yazi-dds/           # Yazi data distribution service
+├── yazi-fm/            # Yazi File Manager
+├── yazi-plugin/        # Yazi plugin system
+├── yazi-proxy/         # Yazi event proxy
+├── yazi-scheduler/     # Yazi task scheduler
+├── yazi-shared/        # Yazi shared library
+├── .github/            # GitHub-specific files and workflows
+├── Cargo.toml          # Rust workflow configuration
+└── README.md           # Project overview
+```
+
+## Development Setup
+
+1. Ensure the latest stable Rust is installed:
+
+   ```sh
+   rustc --version
+   cargo --version
+   ```
+
+2. Build the project:
+
+   ```sh
+   cargo build
+   ```
+
+3. Run the tests:
+
+   ```sh
+   cargo test
+   ```
+
+4. Format the code (requires `rustfmt` nightly):
+
+   ```sh
+   rustup component add rustfmt --toolchain nightly
+   rustfmt +nightly **/*.rs
+   ```
+
+## How to Contribute
+
+### Reporting Bugs
+
+If you find a bug, please file an issue.
+
+### Suggesting Features
+
+If you have a feature request, please file an issue.
+
+### Improving Documentation
+
+Yazi's documentation placed at [yazi-rs/yazi-rs.github.io](https://github.com/yazi-rs/yazi-rs.github.io), contributions related to documentation need to be made within this repository.
+
+### Submitting Code Changes
+
+1. Create a new branch for your changes:
+
+   ```sh
+   git checkout -b your-branch-name
+   ```
+
+2. Make your changes. Ensure that your code follows the project's [coding style](https://github.com/sxyazi/yazi/blob/main/rustfmt.toml) and passes all tests.
+3. Commit your changes with a descriptive commit message:
+
+   ```sh
+   git commit -m "feat: an awesome feature"
+   ```
+
+4. Push your changes to your fork:
+   ```sh
+   git push origin your-branch-name
+   ```
+
+## Pull Request Process
+
+1. Ensure your fork is up-to-date with the upstream repository:
+
+   ```sh
+   git fetch upstream
+   git checkout main
+   git merge upstream/main
+   ```
+
+2. Rebase your feature branch onto the main branch:
+
+   ```sh
+   git checkout your-branch-name
+   git rebase main
+   ```
+
+3. Create a pull request to the `main` branch of the upstream repository. Follow the pull request template and ensure that:
+   - Your code passes all tests and lints.
+   - Your pull request description clearly explains the changes and why they are needed.
+4. Address any review comments. Make sure to push updates to the same branch on your fork.