Document an example setup of CoreOS

1-coreos/1-prepare-ignition-files/example.bu

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+variant: fcos
+version: 1.4.0
+passwd:
+  users:
+    - name: core
+      ssh_authorized_keys:
+        - ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJwojmm5GUDQTt/ic1w3yf5c0fyiPqhy8D9Y4qMVljEA othrayte@gmail.com

1-coreos/1-prepare-ignition-files/example.ign

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+{
+  "ignition": {
+    "version": "3.3.0"
+  },
+  "passwd": {
+    "users": [
+      {
+        "name": "core",
+        "sshAuthorizedKeys": [
+          "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJwojmm5GUDQTt/ic1w3yf5c0fyiPqhy8D9Y4qMVljEA othrayte@gmail.com"
+        ]
+      }
+    ]
+  }
+}

1-coreos/1-prepare-ignition-files/readme.md

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+1. Ensure butane is installed `dnf install butane`
+2. Compile butane files into ignition files
+    `butane --pretty --strict example.bu --output example.ign`