add example for setting up grafana dashboard

[anushkamittal2001]

Related issue

N/A (recently setup grafana with kind cluster and struggled a bit)

Proposed Changes

Add an example of setting up kyverno with grafana in a kind clusyter

Checklist

• [x] I have read the contributing guidelines.
• [x] I have inspected the website preview for accuracy.
• [x] I have signed off my issue.