Added tfvars and readme file

Signed-off-by: Punith Kenchappa <[email protected]>

tf/add-powervm-workers/README.md

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+# Add PowerVM workers to Intel cluster
+
+User need to uopdate required vales in data/vars.tfvars file such as username and password of IBM intranet credentials to get access to the PowerVC.
+```
+auth_url                    = "https://scnlonprema.pokprv.stglabs.ibm.com:5000/v3/"
+user_name                   = "***@us.ibm.com"
+password                    = "***"
+```
+
+### Use Terraform command to plan and apply .
+
+  ```
+  terraform plan -var-file=data/vars.tfvars
+  ```
+
+  ```
+  terraform apply -var-file=data/vars.tfvars
+  ```
+
+### Configure the DHCP and restart the dhcpd service.
+
+Get the MAC Address and IP Address of the VM created on PowerVC. Update /etc/dhcp/dhcpd.conf with the lease/addresses as shown below.
+
+  ```
+  host workerp-0 { hardware ethernet fa:16:3e:0f:95:6b; fixed-address 10.20.177.243; }
+  ```
+
+* Restart the dhcpd.
+  ```
+  systemctl restart dhcpd
+  ```
+* Restart the Worker node for ignition to start.
+
+* Approve the CSR certificate to add the worker to intel cluster.
+  ```
+  oc get csr
+  ```
+  ```
+  oc adm certificate approve <certificate-name>
+  ```
+
+
+

tf/add-powervm-workers/powervm.tfvars

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+################################################################
+# Copyright 2024 - IBM Corporation. All rights reserved
+# SPDX-License-Identifier: Apache-2.0
+################################################################
+
+auth_url                    = "https://scnlonprema.pokprv.stglabs.ibm.com:5000/v3/"
+user_name                   = "***@us.ibm.com"
+password                    = "***"
+ignition_ip                 = "10.20.29.41"
+resolver_ip                 = "10.20.29.41"
+resolve_domain              = ""
+insecure                    = true
+tenant_name                 = "base-ocp"
+domain_name                 = "Default"
+network_name                = "vlan1337"
+power_worker_prefix         = "power-worker-"
+flavor_id                   = "29fcd15b-c41c-4b9b-90b7-43bbf914c2df"
+image_id                    = "3f877d0e-84e8-41fe-988d-318ea1521b0a"
+openstack_availability_zone = "e980"
+worker_count                = 2