docs: add dx related story/example

Signed-off-by: Fabrizio Sestito <[email protected]>

rfc/0020-policy-group.md

@@ -25,6 +25,7 @@ and enables the creation of custom policies using a DSL-like configuration.
 [examples]: #examples
 
 - As a user, I want to create a policy that is composed of other policies and is evaluated using a boolean expression.
+- As a user, I want to develop and test a policy group with the help of kwctl.
 
 # Detailed design
 
@@ -275,6 +276,11 @@ Also, we could consider creating a [custom package](https://rhai.rs/book/rust/pa
 The policy server will support [raw policy](https://docs.kubewarden.io/tutorials/writing-policies/wasi/raw-policies) groups out of the box, since the group evaluation logic is implemented in the `EvaluationEnvironment`.
 It will be possible to define a policy group with raw policies only, and evaluate the expression by calling the `validate_raw/<group name>` endpoint.
 
+## Development
+
+The `kwctl` tool will be extended to support the policy groups, to allow users to develop and test policy groups locally.
+For this reason, it might be necessary to move the `EvaluationEnvironment` to the `policy-evaluator` crate and to refactor `kwctl` accordingly.
+
 ## Preliminary benchmark
 
 The following results are based on the [Kubewarden k6 load test](https://github.com/kubewarden/load-testing/tree/k6) using the [psp-apparmor policy](https://github.com/kubewarden/apparmor-psp-policy)