chore: add missing chart README file

charts/app-dashboard/README.md

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+#  Helm Chart for app-dashboard
+
+This Helm chart provides a way to deploy app-dashboard on Kubernetes cluster.
+The chart includes the necessary configuration files, resources, and dependencies to deploy the component in an kubernetes environment.
+
+## Prerequisites
+
+To use this Helm chart, you must have the following:
+
+- Kubernetes cluster version 1.16+
+- Helm version 3+
+
+## TL;DR
+
+To install the Helm chart, use the following command:
+`helm install app-dashboard .`
+
+This will deploy the component to your Kubernetes cluster.
+
+## Configuration
+
+You can customize the configuration options amending `values.yaml` file and specifying your desired values.
+
+## License
+This project is licensed under the Apache License, Version 2.0. See the `LICENSE` file for more information.