Added basic README.md and tests.

Author: pantierra

helm/README.md

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+# STAC Auth Proxy Helm Chart
+
+A Helm chart for deploying [STAC Auth Proxy](https://developmentseed.org/stac-auth-proxy) on Kubernetes.
+
+## Overview
+
+This chart deploys a reverse proxy that adds authentication and authorization capabilities to your STAC API using OpenID Connect (OIDC).
+
+## Prerequisites
+
+- Kubernetes 1.19+
+- Helm 3.0+
+- An OIDC provider (e.g., Keycloak, Auth0, Google, etc.)
+- A STAC API backend
+
+## Installation
+
+```bash
+helm install stac-auth-proxy ./stac-auth-proxy \
+  --set env.UPSTREAM_URL=https://your-stac-api.example.com \
+  --set env.OIDC_DISCOVERY_URL=https://your-oidc-provider.example.com/.well-known/openid-configuration \
+  --set ingress.host=stac-proxy.example.com
+```
+
+## Configuration
+
+### Required Values
+
+| Parameter | Description |
+|-----------|-------------|
+| `env.UPSTREAM_URL` | URL of the upstream STAC API |
+| `env.OIDC_DISCOVERY_URL` | OpenID Connect discovery URL |
+| `ingress.host` | Hostname for the ingress |
+
+### Common Configurations
+
+See [`values.yaml`](./values.yaml) for all available configuration options, including:
+
+- **Authentication**: Configure OIDC settings and endpoint protection
+- **Resources**: Set CPU/memory limits and requests
+- **Ingress**: Configure TLS, annotations, and hostname
+- **Security**: Pod and container security contexts
+
+### Example: Custom Values File
+
+```yaml
+# custom-values.yaml
+image:
+  tag: "v1.0.0"
+
+ingress:
+  host: "my-stac-api.example.com"
+
+env:
+  UPSTREAM_URL: "https://stac-api.internal:8080"
+  OIDC_DISCOVERY_URL: "https://my-auth.example.com/.well-known/openid-configuration"
+  DEFAULT_PUBLIC: false
+```
+
+Install with custom values:
+
+```bash
+helm install stac-auth-proxy ./stac-auth-proxy -f custom-values.yaml
+```
+
+## Upgrading
+
+```bash
+helm upgrade stac-auth-proxy ./stac-auth-proxy -f custom-values.yaml
+```
+
+## Uninstalling
+
+```bash
+helm uninstall stac-auth-proxy
+```
+
+## Documentation
+
+For more information about STAC Auth Proxy features and configuration:
+- [Project Documentation](https://developmentseed.org/stac-auth-proxy)
+- [GitHub Repository](https://github.com/developmentseed/stac-auth-proxy)