Add changelog to main branch (#206)

Co-authored-by: kate-osborn <50597707+kate-osborn@users.noreply.github.com>
(cherry picked from commit e87a7ca)

Author: pleshakov

CHANGELOG.md

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+# Changelog
+
+This document includes a curated changelog for each release. We also publish a changelog as the description of a [GitHub release](https://github.com/nginxinc/nginx-kubernetes-gateway/releases), which, by contrast, is auto-generated and includes links to all PRs that went into the release.
+
+## Release 0.1.0
+
+*August 22, 2022*
+
+This is an initial release of NGINX Kubernetes Gateway project.
+
+The release includes:
+- A control plane agent (a Kubernetes controller) that updates date plane (NGINX) configuration based on the state of the resources in the cluster.
+- Support for NGINX as a data plane.
+- Kubernetes manifests for a Deployment with a single Pod with the control plane and data plane containers as well as Services to enable external connectivity to that Pod.
+- Support for a subset of features of GatewayClass, Gateway and HTTPRoute resources (see the [Gateway API Compatibility doc](https://github.com/nginxinc/nginx-kubernetes-gateway/blob/v0.1.0/README.md)).
+
+We expect that the architecture of NGINX Kubernetes Gateway -- the number of pods and containers and their interaction -- will change as the project evolves.
+
+NGINX Kubernetes Gateway is ready for experimental usage. We included the [docs](https://github.com/nginxinc/nginx-kubernetes-gateway/tree/v0.1.0/docs) as well as [examples](https://github.com/nginxinc/nginx-kubernetes-gateway/tree/v0.1.0/examples).
+
+If you'd like to give us feedback or get involved, see the [README](https://github.com/nginxinc/nginx-kubernetes-gateway) to learn how.
+
+COMPATIBILITY:
+- The Gateway API version: `0.5.0`
+- NGINX version: `1.21.3` 
+- Kubernetes version: `1.19+`
+
+CONTAINER IMAGES:
+- Control plane: `ghcr.io/nginxinc/nginx-kubernetes-gateway:0.1.0`