Add docs

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

docs/dev_update_dependencies.md

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+# Update the dependencies
+
+The dependencies are the version of Loki, Mimir, Agent and so on that are included in this chart.
+The current versions can be found in the [Chart.yaml](../charts/meta-monitoring/Chart.yaml) file.
+
+Run this in the charts/meta-monitoring directory after updating a dependency:
+
+```
+helm dependency update meta-monitoring
+```
+
+List the current dependencies:
+
+```
+helm dependency list meta-monitoring
+```

docs/installation.md

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+# 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
+   ```