doc: add pika-operator guide on readme

[machinly]

This PR add some guide for pika-operator on readme, which will help people to use pika-operator deploy pika on kubernetes envirment.

Because the pika-operator is still relatively simple and not suitable for use in a production environment, a disclaimer has also been added to the guide.

[cr-gpt]

Based on the provided code patch, here are some observations and suggestions for improvement:

1. Consider adding comments: It's beneficial to include comments in the code to provide clarity and make it easier for other developers to understand the code's functionality.

2. Error handling: Ensure that appropriate error handling mechanisms are in place to handle any potential errors or exceptions that may occur during execution.

3. Input validation: Validate the command-line arguments passed to the script or function to ensure they meet the expected format and values. This helps prevent unexpected behavior or security vulnerabilities.

4. Security considerations: When using private registries, make sure to handle authentication and authorization properly to maintain security. Avoid storing sensitive information directly in the code (such as usernames and passwords) and consider using environment variables or secure secrets management solutions.

5. Documentation: Provide clear and comprehensive documentation for the steps required to deploy and use the pika-operator in a Kubernetes environment. Include any necessary prerequisites and helpful tips to aid users in the deployment process.

6. Maintainability: Create thorough unit tests to ensure the reliability and maintainability of the codebase. Additionally, consider adhering to coding best practices and conventions for consistent style and readability.

It's important to review the specific implementation details of the script or function to identify any bugs or issues accurately.

[cr-gpt]

Without the complete context of the code, it's difficult to provide a comprehensive code review. However, based on the provided code snippet, here are some observations:

1. Comments: The comments in the code are helpful for providing instructions and context, which is good practice.

2. Documentation: It's great that you have included documentation on how to deploy and use pika-operator in a Kubernetes environment. Documenting installation steps and usage instructions makes it easier for others to understand and use your code.

3. Error handling: It's not clear from the given code snippet how error handling is done. Proper error handling is crucial to ensure the stability and reliability of the application. Make sure to handle any potential errors that may occur during deployment and when interacting with the pika instance.

4. Testing: It's important to thoroughly test the functionality of your code to identify any bugs or issues. Automated unit tests and integration tests can help ensure the correctness of your code.

5. Security considerations: Ensure that you follow security best practices when deploying applications, especially in production environments. Use secure configurations, such as strong passwords or authentication methods, to protect sensitive data.

Overall, it seems like a good starting point, but further review and testing would be necessary to fully assess any bug risks and suggest improvements.