Add Terraform with Equinix Metal:

This gets the Tinkerbell Sandbox up and running with
Terraform on Equinix Metal.

Signed-off-by: Jacob Weinstock <jakobweinstock@gmail.com>

README.md

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+# Quick-Starts
+
+The following quick-start guides will walk you through standing up the Tinkerbell stack.
+There are a few options for this.
+Pick the one that works best for you.
+
+## Options
+
+- [Vagrant and VirtualBox](docs/quickstarts/VAGRANTVBOX.md)
+- [Vagrant and Libvirt](docs/quickstarts/VAGRANTLVIRT.md)
+- [Docker Compose](docs/quickstarts/COMPOSE.md)
+- [Terraform and Equinix Metal](docs/quickstarts/TERRAFORMEM.md)
+- [Kubernetes](docs/quickstarts/KUBERNETES.md)
+- [Multipass](docs/quickstarts/MULTIPASS.md)
+
+## Next Steps
+
+Now that you have a Tinkerbell stack up and running, you can start provisioning machines.
+Tinkerbell.org has a [list of guides](https://docs.tinkerbell.org/deploying-operating-systems/the-deployment/) for provisioning machines.
+You can also create your own.
+The following docs will help you get started.
+
+1. [Create Hardware Data](https://docs.tinkerbell.org/setup/local-vagrant/#creating-the-workers-hardware-data)
+2. [Create a Template](https://docs.tinkerbell.org/setup/local-vagrant/#creating-a-template)
+3. [Create a Workflow](https://docs.tinkerbell.org/setup/local-vagrant/#creating-the-workflow)
+
+### In the Sandbox
+
+1. Create your own templates
+
+   ```bash
+   docker exec -i compose_tink-cli_1 tink template create < ./custom-template.yaml
+   ```
+
+2. Upload any container images you want to use in the templates to the internal registry
+
+   ```bash
+   docker run -it --rm quay.io/containers/skopeo copy --all --dest-tls-verify=false --dest-creds="admin":"Admin1234" docker://hello-world docker://192.168.50.4/hello-world
+   ```
+
+3. Create a workflow
+
+   ```bash
+   docker exec -i compose_tink-cli_1 tink workflow create -t <TEMPLATE ID> -r '{"device_1":"08:00:27:00:00:01"}')
+   ```
+
+4. Restart the machine to provision (if using the vagrant sandbox test machine this is done by running vagrant destroy -f machine1 && vagrant up machine1