feat: Added CONTRIBUTING.md guide

CONTIRIBUTING.md

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+# Contributing to KubeCub
+
+## Introduction
+
+Thank you for your interest in contributing to KubeCub! We appreciate your effort and to ensure that your contributions are integrated smoothly, we ask that you follow these guidelines.
+
+## How to Contribute
+
+1. **Fork the repository**: Start by forking the KubeCub repository to your own GitHub account.
+
+2. **Clone the repository**: Clone the forked repository to your local machine.
+
+3. **Create a new branch**: Always create a new branch for each contribution.
+
+4. **Make your changes**: Make your changes and improvements to the new branch.
+
+5. **Test your changes**: Ensure that your changes do not break any existing functionality.
+
+6. **Commit your changes**: Commit your changes with a clear and concise commit message.
+
+7. **Push your changes**: Push your changes to your forked repository.
+
+8. **Create a Pull Request**: Create a pull request from your forked repository to the main KubeCub repository.
+
+## Code of Conduct
+
+We follow the [Code of Conduct](https://github.com/KubeCub/code_of_conduct.md) of the open source community. Please make sure to read and follow it.
+
+## Questions
+
+If you have any questions, please open an issue and we will get back to you as soon as possible.
+
+Thank you for your contributions!