Helm chart: Add missing README.

charts/uffizzi-app/README.md

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+# Uffizzi App Helm Chart
+
+This chart installs [Uffizzi](https://uffizzi.com), the continuous previews application. This is just a standard open-source Uffizzi setup.
+
+### Dependencies
+
+This chart depends upon three subcharts:
+
+- [`bitnami/postgresql`](https://artifacthub.io/packages/helm/bitnami/postgresql)
+- [`bitnami/redis`](https://artifacthub.io/packages/helm/bitnami/redis)
+- [`uffizzi-controller`](https://artifacthub.io/packages/helm/uffizzi-controller/uffizzi-controller)
+
+You can disable the `bitnami` subcharts if you want to manage your own datastores.
+
+## Configuration
+
+### DNS
+
+You'll want to configure the following values to include a hostname you control:
+
+- `app_url`
+- `webHostname`
+- `managed_dns_zone_dns_name`
+- `uffizzi-controller.ingress.hostname`
+
+### Controller
+
+See the Controller's Helm Chart for it's configuration, including its certificate authority.
+
+### Secrets
+
+The following secrets are configurable:
+
+- `global.uffizzi.controller.username`
+- `global.uffizzi.controller.password`
+
+## More Info
+
+See this project's main repository here: https://github.com/UffizziCloud/uffizzi_app
+
+And explore Uffizzi https://uffizzi.com