docs: changelog for v0.0.1-policy-assistant

Signed-off-by: Hunter Gregory <[email protected]>

cmd/policy-assistant/CHANGELOG.md

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+## v0.0.1-policy-assistant
+
+This release contains the `policy-assistant` Command-Line Interface (CLI) and its source code.
+
+Policy Assistant is a project to help users develop/troubleshoot upstream network policies. Current APIs: NetworkPolicy (v1), AdminNetworkPolicy and BaselineAdminNetworkPolicy.
+
+`policy-assistant` is a static analysis tool which can simulate policy verdicts for traffic.
+`policy-assistant` can either read policies/pods from file or from a Kubernetes cluster.
+
+For more information, see the [Policy Assistant README](https://github.com/kubernetes-sigs/network-policy-api/blob/main/cmd/policy-assistant/README.md) or [this demo](https://github.com/kubernetes-sigs/network-policy-api/blob/main/cmd/policy-assistant/examples/demos/walkthrough/README.md).
+
+### What's New
+
+Inaugural release for `policy-assistant`.
+
+### Supported APIs
+
+- NetworkPolicy v1 (networking.k8s.io/v1)
+- AdminNetworkPolicy and BaselineAdminNetworkPolicy [v1alpha1 (policy.networking.k8s.io/v0.1.1)](https://github.com/kubernetes-sigs/network-policy-api/releases/tag/v0.1.1)
+
+### Special Notes
+
+We will be iterating on how we version policy assistant.
+It's possible that future releases will not follow the same release version format.