README and values.json needs to be modified

1. Fix the terraform version

```
ibmcloud schematics workspace new -f values.json --github-token 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
Creating workspace...
FAILED
Found two different values for type terraform_v1.5 and terraform_v1.9 in payload. Correct the payload and try again.
```

The value terraform_v1.5 should be 
```
"name": "hpcaas-test",
  "type": [
    "terraform_v1.9"
  ],
```