Added Azure Arc Gateway

[psinnathurai]

Added Azure Arc Gateway

2. Describe the summary, scope, and intent of this PR:
   Added Azure Arc Gateway

3. Insert links(s) to any related work item(s) or supporting detail:
   https://learn.microsoft.com/en-us/azure-stack/hci/deploy/deployment-azure-arc-gateway-overview

[prmerger-automator]

@psinnathurai : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit 90084f3:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/ready/azure-best-practices/resource-abbreviations.md	✅Succeeded

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[Court72]

@stephen-sumner

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[Court72]

@MicrosoftDocs/patterns-and-practices-team-pr-reviewers - Please review the proposed changes. If you want to move forward with the content, add a sign-off.

#label:"aq-pr-triaged"
#label:"pending-content-team/business-approval"
Cc: @MicrosoftDocs/public-repo-pr-review-team

[v-dirichards]

@MicrosoftDocs/patterns-and-practices-team-pr-reviewers - Please review the proposed changes. If you want to move forward with the content, add a sign-off.

#label:"aq-pr-triaged"
#label:"pending-content-team/business-approval"
Cc: @MicrosoftDocs/public-repo-pr-review-team

[github-actions]

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[v-regandowner]

@stephen-sumner - Is this one okay to merge?