docs(readme): align create-project loader warn with msg-cli

[jsahleen]

Summary

• Stop passing the caught error into console.warn in the README Basic Setup loader, matching current msg create project ESM output.
• Confirmed the Creating a Resource example already matches msg create resource Main Messages; no other Usage scaffold changes were needed.

Closes #67

Test plan

• Diff README Basic Setup against msg create project Main en zh fr --format MF1 (allowing illustrative TRANSLATION_IMPORT_PATH)
• Confirm the loader warn is message-only (no , error)
• Confirm Creating a Resource still matches msg create resource Main Messages

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