Fix Hiero-Automation File

[aceppaluni]

Our current Hiero-Automation file is missing 3 required links for readme, signingGuide, and mergeConflictsGuide.

We need to add these fields to correct our failing workflows.

[github-actions]

Thanks for your submission.

This issue is awaiting approval from @hiero-ledger/hiero-enterprise-java-committers and @hiero-ledger/hiero-enterprise-java-maintainers.

[github-actions]

Approved by @hiero-ledger/hiero-enterprise-java-committers and @hiero-ledger/hiero-enterprise-java-maintainers.