Adding coderabbit configuration file

[deluciac]

This configuration files provides the YAML config for managing coderabbit's behavior on this repository. To summarize a few of the points:

• CodeRabbit will review PRs automatically (auto_review -> enabled: true). Changing this to false will stop the auto review. There's also support for manual triggers (ex: @coderabbitai review)
• CodeRabbit is given natural language instructions in this config to focus on performing a security review with the added context that this is a deliberately vulnerable application and check for unintentional vulnerabilities
• Certain parts of the codebase have been explicitly excluded (see path_filters). We can expand upon this as needed.

Finally, this is just the configuration file. We may need have a repo/org maintainer authorize access to the PwnzzAI repo from the app (https://app.coderabbit.ai/). I can follow up with more details. We can adjust this configuration as needed and monitor to see if it's providing value.

CodeRabbit's Configuration references: link