feat: Initialize VitePress documentation system with multi-language content, custom theme, and assets.

CONTRIBUTING.md

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+# Contributing to MIVO
+
+First off, thank you for considering contributing to MIVO. It is people like you that make MIVO such a great tool.
+
+## Code of Conduct
+
+By participating in this project, you are expected to uphold our Code of Conduct. Please report unacceptable behavior to us.
+
+## How Can I Contribute?
+
+### Reporting Bugs
+
+This section guides you through submitting a bug report for MIVO. Following these guidelines helps maintainers and the community understand your report, reproduce the behavior, and find related reports.
+
+- **Use a clear and descriptive title** for the issue to identify the problem.
+- **Describe the exact steps to reproduce the problem** in as many details as possible.
+- **Provide specific examples** to demonstrate the steps.
+- **Describe the behavior you observed** after following the steps and point out what exactly is the problem with that behavior.
+- **Explain which behavior you expected to see instead** and why.
+- **Include screenshots** if the issue is related to the User Interface.
+
+### Suggesting Enhancements
+
+This section guides you through submitting an enhancement suggestion for MIVO, including completely new features and minor improvements to existing functionality.
+
+- **Use a clear and descriptive title** for the issue to identify the suggestion.
+- **Provide a step-by-step description of the suggested enhancement** in as many details as possible.
+- **Provide specific examples** to demonstrate the steps.
+- **Describe the current behavior** and explain which behavior you expected to see instead and why.
+
+### Pull Requests
+
+The process described here has several goals:
+
+- Maintain MIVO's quality.
+- Fix problems that are important to users.
+- Engage the community in working toward the best possible MIVO.
+- Enable a sustainable system for MIVO's maintainers to review contributions.
+
+Please follow these steps to have your contribution considered by the maintainers:
+
+1.  Follow all instructions in the template.
+2.  Follow the style guides.
+3.  After you submit your pull request, check that all status checks are passing.
+
+## Development Setup
+
+### Prerequisites
+
+- PHP 8.1 or higher
+- Composer
+- Node.js and npm (for frontend assets and documentation)
+
+### Installation
+
+1.  Clone the repository.
+2.  Run `composer install` to install PHP dependencies.
+3.  Run `npm install` to install frontend dependencies.
+4.  Copy `.env.example` to `.env` and configure your environment variables.
+
+## Styleguides
+
+### Git Commit Messages
+
+- Use the present tense ("Add feature" not "Added feature").
+- Use the imperative mood ("Move cursor to..." not "Moves cursor to...").
+- Limit the first line to 72 characters or less.
+- Reference issues and pull requests liberally after the first line.
+
+### PHP Styleguide
+
+- We follow PSR-12 coding standard.
+- Use strict typing where possible.
+
+### Documentation Styleguide
+
+- Use Markdown.
+- Limit line length to 80 characters.
+- Use clear and concise language.
+- **Do not use emojis.**
+
+## License
+
+By contributing, you agree that your contributions will be licensed under its MIT License.