docs: Add organization-wide CONTRIBUTING.md file

CONTRIBUTING.md

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+# Contributing to AlphaRages 🚀
+
+Hi there! We're thrilled that you're interested in contributing to our projects. The time and effort from community contributors are greatly valued and help us grow and improve.
+
+This document is a guide to help you make your contribution as smooth as possible.
+
+## Code of Conduct
+
+First and foremost, we expect all community members to abide by our [Code of Conduct](LINK_TO_CODE_OF_CONDUCT). Please make sure you are welcoming and respectful in all of our interactions. (Note: If this file does not exist yet, you can remove this section or leave it as a reminder to create one).
+
+## How Can You Contribute?
+
+There are many ways to contribute, not just with code!
+
+* **Reporting Bugs:** If you find an error, please let us know.
+* **Suggesting Enhancements:** Have an idea for a new feature or an improvement to an existing one? We'd love to hear it.
+* **Writing Documentation:** Documentation can always be improved.
+* **Contributing Code:** Helping to fix bugs or implement new features.
+
+## Reporting a Bug
+
+If you've found a bug, please open an **Issue** in the corresponding project repository. To help us resolve the problem quickly, please include as many details as possible:
+
+1.  **Describe the bug:** What happened, and what did you expect to happen?
+2.  **Steps to Reproduce:** A step-by-step guide on how we can encounter the same error.
+3.  **Environment:** What operating system, project version, and Node.js/Flutter/etc. version are you using?
+4.  **Logs or Screenshots:** If possible, attach any relevant error logs or screenshots.
+
+## Suggesting an Enhancement
+
+To suggest an enhancement, please open an **Issue** with the following information:
+
+1.  **A clear title:** E.g., "Enhancement: Add Google Sign-In option".
+2.  **Describe the problem:** What problem does your suggestion solve? Why would it be useful?
+3.  **Proposed solution:** Describe how you imagine the feature working.
+
+## Your First Code Contribution
+
+Ready to write some code? Great! Here is the workflow we use:
+
+1.  **Claim an Issue:** Find an issue you want to resolve and comment on it to let us know you'd like to work on it. Please wait for a maintainer to give you the "go-ahead" before you start. This prevents duplicated work.
+
+2.  **Fork the Repository:** Create a fork of the repository to your own GitHub account.
+
+3.  **Clone Your Fork:** Download your fork to your local machine.
+    ```bash
+    git clone [https://github.com/YOUR-USERNAME/REPOSITORY-NAME.git](https://github.com/YOUR-USERNAME/REPOSITORY-NAME.git)
+    ```
+
+4.  **Create a Branch:** Never work directly on the `main` branch. Create a new branch for your changes with a descriptive name.
+    ```bash
+    # For a new feature
+    git checkout -b feat/feature-name
+
+    # For a bug fix
+    git checkout -b fix/bug-description
+    ```
+
+5.  **Make Your Changes:** Write the code, fix the bug, or improve the documentation.
+
+6.  **Commit Your Changes:** Add your changes and create a commit with a clear message, following the [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) standard.
+    ```bash
+    git add .
+    git commit -m "feat: Add Google Sign-In functionality"
+    ```
+
+7.  **Push to Your Fork:** Push your branch with your changes to your repository on GitHub.
+    ```bash
+    git push origin feat/feature-name
+    ```
+
+8.  **Open a Pull Request (PR):** Go to the original repository's page, and you will see a prompt to create a Pull Request from your new branch. Fill out the PR template with a clear description of what you've done.
+
+That's it! One of the maintainers will review your work, might ask for some changes, and then merge it into the project.
+
+Thank you again for your contribution! ❤️