feat: init commit

crates/burrego/examples/opa/utility/README.md

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+# Open Policy Agent utility
+
+This folder contains the entry point for Open Policy Agent policies.
+
+Since Open Policy Agent policies have to produce an `AdmissionReview`
+object, this utility library contains the Rego entry point that
+generates such `AdmissionReview`, based on whether the `deny` query
+inside the package `kubernetes.admission` (defined by the policy
+itself) is evaluated to `true`.
+
+If `deny` evaluates to true, the produced `AdmissionReview` will
+reject the request. Otherwise, it will be accepted.