README.md: update

Author: benben

README.md

@@ -1,2 +1,21 @@
-# helm-charts
-Checkly helm charts
+# Checkly Helm Charts
+
+[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
+
+## Usage
+
+[Helm](https://helm.sh) must be installed to use the charts. Please refer to Helm's [documentation](https://helm.sh/docs) to get started.
+
+Once Helm has been set up correctly, add the repo as follows:
+
+    helm repo add checkly https://checkly.github.io/helm-charts
+
+If you had already added this repo earlier, run `helm repo update` to retrieve the latest versions of the packages. You can then run `helm search repo checkly` to see all available charts.
+
+## Contributing
+
+tbd
+
+## License
+
+[Apache 2.0 License](https://github.com/checkly/helm-charts/blob/main/LICENSE).