Add docs

Signed-off-by: Michel Hollands <michel.hollands@grafana.com>

docs/installation.md

@@ -0,0 +1,27 @@
+# Install this chart
+
+1. Create the meta namespace
+
+   ```
+   kubectl create namespace meta
+   ```
+
+1. Create a values.yaml file based on the [default one](../charts/meta-monitoring/values.yaml).
+
+1. Install this helm chart
+
+   ```
+   helm install -n meta meta ./charts/meta-monitoring
+   ```
+
+1. Upgrade
+
+   ```
+   helm upgrade --install -n meta meta ./charts/meta-monitoring
+   ```
+
+1. Delete this chart:
+
+   ```
+   helm delete -n meta meta
+   ```