docs: include catalog image names readme.md

[surajsbharadwaj]

Description

Add readme to list the catalog images to be imported into PowerVS workspace

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[surajsbharadwaj]

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[terraform-ibm-modules-ops]

🎉 This PR is included in version 3.0.0 🎉

The release is available on:

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• v3.0.0

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