docs(deploy/helm): update README.md

Signed-off-by: Vaughn Dice <[email protected]>

Author: vdice

deploy/helm/README.md

@@ -0,0 +1,40 @@
+# runtime-class-manager
+
+runtime-class-manager is a Kubernetes operator that manages installation of Wasm shims onto nodes and related Runtimeclasses via [Shim custom resources](../../config/crd/bases/runtime.kwasm.sh_shims.yaml).
+
+## Prerequisites
+
+- [Kubernetes v1.20+](https://kubernetes.io/docs/setup/)
+- [Helm v3](https://helm.sh/docs/intro/install/)
+
+## Installing the chart
+
+The following installs the runtime-class-manager chart with the release name `rcm`:
+
+```shell
+helm upgrade --install \
+  --namespace rcm \
+  --create-namespace \
+  --wait \
+  rcm .
+```
+
+## Post-installation
+
+With runtime-class-manager running, you're ready to create one or more Wasm Shims. See the samples in the [config/samples directory](../../config/samples/).
+
+> Note: Ensure that the `location` for the specified shim binary points to the correct architecture for your Node(s)
+
+For example, here we install the Spin shim:
+
+```shell
+kubectl apply -f ../../config/samples/test_shim_spin.yaml
+```
+
+Now when you annotate one or more nodes with a label corresponding to the `nodeSelector` declared in the Shim, runtime-class-manager will install the shim as well as create the corresponding Runtimeclass:
+
+```shell
+kubectl label node --all spin=true
+```
+
+You are now ready to deploy your Wasm workloads.