Issue: Missing setup instructions for CNPG-I plugin development

While following the README to bootstrap and run the CNPG-I plugin, I encountered several missing or unclear setup steps that can block new contributors or users unfamiliar with the environment. These should be documented for a smoother experience.

Problems faced:

• make was not available by default; needed to install it manually.

• The kustomize CLI was also missing and required separate installation.

• A mention of needing kubebuilder or controller-gen would help for schema generation or CRD updates.

• No instructions were given about ensuring the cert-manager and CNPG operator pods are fully ready before applying the plugin manifest.

• The manifest.yaml file was not directly available unless release artifacts were built manually clarifying that or pointing to an example would help.

Suggested Fixes:

• Add a "Prerequisites" section in the README listing required tools (make, kustomize, kubectl, etc.) and links to install them.

• Add a step to wait/check for CNPG and cert-manager readiness (kubectl rollout status) before plugin deployment.

• Clarify where/how to obtain the manifest.yaml (either via GitHub Actions or building locally).

• Optional: Link to common errors and troubleshooting steps for known gotchas.

I'm working on this and will open a PR shortly with the changes.
Please feel free to suggest improvements once it's up.

Start with the README and compare its bootstrap and deployment steps against the listed gaps: make, kustomize, kubectl, kubebuilder or controller-gen, dependency readiness, and manifest.yaml availability. Check how GitHub Actions or local builds produce the manifest. Done means the README has prerequisite links, readiness checks, and a clear path to obtain or build the manifest, with troubleshooting guidance where useful.