Adds README to Helm chart

charts/fluent-operator/README.md

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+# Fluent Operator Helm chart
+
+[Fluent Operator](https://github.com/fluent/fluent-operator/) provides a Kubernetes-native logging pipeline based on Fluent-Bit and Fluentd.
+
+## Installation
+
+To install or upgrade Fluent Operator using Helm:
+
+```shell
+export FLUENT_OPERATOR_CONTAINER_RUNTIME="containerd" # or "cri-o", "docker" depending on the container runtime being used (see `values.yaml`)
+
+helm repo add fluent https://fluent.github.io/helm-charts
+helm upgrade --install fluent-operator fluent/fluent-operator \
+  --create-namespace \ 
+  --set containerRuntime=${FLUENT_OPERATOR_CONTAINER_RUNTIME}
+```
+
+By default, all CRDs required for Fluent Operator will be installed.  To prevent `helm install` from installing CRDs, you can set `fluent-bit.crdsEnable` or `fluentd.crdsEnable` to `false`.  
+
+## Upgrading
+
+Helm [does not manage the lifecycle of CRDs](https://helm.sh/docs/chart_best_practices/custom_resource_definitions/), so if the Fluent Operator CRDs already exist, subsequent 
+chart upgrades will not add or remove CRDs even if they have changed.  During upgrades, users should manually update CRDs:
+
+```
+wget https://github.com/fluent/fluent-operator/releases/download/<version>/fluent-operator.tgz
+tar -xf fluent-operator.tgz
+kubectl replace -f fluent-operator/crds
+```
+
+## Chart Values
+
+```
+helm show values fluent/fluent-operator
+```