docs(bot): 📝 Add guide on how to add a new node to the cluster to README.

README.md

@@ -78,6 +78,11 @@ commands to enable them:
 ```sh
 microk8s enable dns
 microk8s enable ha-cluster
+microk8s enable community
+
+sudo systemctl enable iscsid  # Needed to run the following command.
+
+microk8s enable openebs
 ```
 
 The rest of the guide uses `kubectl`, but `microk8s` has `kubectl` as a subcommand, so either:
@@ -89,6 +94,18 @@ The rest of the guide uses `kubectl`, but `microk8s` has `kubectl` as a subcomma
 2. Use `microk8s kubectl` instead of `kubectl` in the following steps. This'll require you to type
    `microk8s` at the front of all `kubectl` commands that are run from now on.
 
+##### Add a Node to the Cluster
+
+To add a new node to the cluster, run the following command on a master node:
+
+```sh
+microk8s add-node
+```
+
+You'll get a command to paste in your new node. Copy the one that ends with `--worker` and paste it
+in your new node. Wait a few minutes until it connects, and then you're ready to go! No need to
+follow the steps down below if the cluster is already up and running.
+
 ## Deploying Payphone
 
 The following steps show how to pull and install Payphone on a running cluster of nodes.