Add multi-arch built and contributing

.github/workflows/docker-image.yml

···
           context: .
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
+          platforms: linux/amd64,linux/arm64
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=gha
           cache-to: type=gha,mode=max

CONTRIBUTING.md

···
+# Contributing to paw
+
+Welcome to paw! We appreciate your interest in contributing to my project.
+
+How to Contribute
+To contribute to paw, please follow these steps:
+
+1. **Fork the Repository:** Click the "Fork" button in the top-right corner of the repository's page on GitHub. This will create a copy of the repository in your GitHub account.
+
+2. **Clone the Repository:** Clone your forked repository to your local machine using the following command:
+
+```bash
+git clone https://github.com/<your-username>/paw.git
+```
+
+3. **Create a New Branch:** Create a new branch for your contribution:
+
+```bash
+git checkout -b feature/feature-name
+```
+
+Replace feature-name with a descriptive name for your contribution.
+
+4. **Make Changes:** Make your desired changes to the codebase. Ensure that your changes adhere to the project's coding style and guidelines.
+
+5. **Commit Changes:** Commit your changes with a descriptive commit message:
+
+```bash
+git commit -m "Add feature or fix issue"
+```
+
+6. **Push Changes:** Push your changes to your forked repository:
+
+```bash
+git push origin feature-name
+```
+
+7. **Submit a Pull Request (PR):** Go to the GitHub page of your forked repository. Click on the _"New Pull Request"_ button and submit a PR with your changes. Provide a descriptive title and description for your PR, detailing the changes you've made.
+
+## Code Review Process
+
+All PRs will be reviewed by project maintainers. Feedback may be provided, and changes may be requested before the PR is merged. Contributors are expected to address any feedback promptly.
+
+## Reporting Issues
+
+If you encounter any bugs, errors, or have suggestions for improvements, please [open an issue](https://github.com/aottr/paw/issues/new) on GitHub. Provide detailed information about the issue or suggestion, including steps to reproduce, if applicable.
+
+Thank you for contributing to paw! ❤️🐾