task: add README for unleash-proxy chart (#66)

Co-authored-by: Thomas Heartman <[email protected]>

charts/unleash-proxy/README.md

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+# The Unleash Proxy
+
+The Unleash proxy offers a way to use Unleash in client-side applications, such as single-page and native apps.
+
+The Unleash proxy sits between the Unleash API and your client-side SDK and does the evaluation of feature toggles for your client-side SDK. This way, you can keep your configuration private and secure, while still allowing your client-side apps to use Unleash's features.
+
+The proxy offers three important features:
+
+- **Performance**: The caches all features in memory and can run close to your end-users. A single instance can handle thousands of requests per second, and you can easily scale it by adding additional instances.
+- **Security**: The proxy evaluates the features for the user on the server-side and by default only exposes results for features that are **enabled** for the specific user. No feature toggle configuration is ever shared with the user.
+- **Privacy**: If you run the proxy yourself, Unleash will never get any data on your end-users: no user ids, no IPs, no nothing.
+
+
+You can read more about the proxy [in the Unleash proxy reference documentation](https://docs.getunleash.io/reference/unleash-proxy).
+
+## Prerequisites
+- Kubernetes 1.16+
+- Helm 3+
+
+## Get Repo Info
+
+```console
+helm repo add unleash https://docs.getunleash.io/helm-charts
+helm repo update
+```
+
+_See [helm repo](https://helm.sh/docs/helm/helm_repo/) for command documentation._
+
+## Install Chart
+
+```console
+helm install unleash-proxy unleash/unleash-proxy
+```
+
+_See [configuration](#configuration) below._
+
+_See [helm install](https://helm.sh/docs/helm/helm_install/) for command documentation._
+
+## Dependencies
+
+The functionality of unleash-proxy is dependent on having a running Unleash installation, however, this chart does not have any other dependencies and can be configured to use an in-cluster Unleash instance or an instance hosted somewhere else. See [configuration](#configuration)
+
+## Uninstall Chart
+
+```console
+helm uninstall unleash-proxy
+```
+
+This removes all the Kubernetes components associated with the chart and deletes the release.
+
+_See [helm uninstall](https://helm.sh/docs/helm/helm_uninstall/) for command documentation._
+
+## Upgrading Chart
+
+```console
+helm upgrade unleash-proxy unleash/unleash-proxy --install
+```
+
+_See [helm upgrade](https://helm.sh/docs/helm/helm_upgrade/) for command documentation._
+
+## Configuration
+
+See description of configuration in [values.yaml](./values.yaml)