Add quick start contribution note

[GettingAdam]

This PR adds a short quick-start note for contributors to the OneDrive API docs repository.

[learn-build-service-prod]

Learn Build status updates of commit bbac3c0:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
docs/file-handlers/define-actions.md	⚠️Warning	View (>= odsp-graph-online)	Details
docs/file-handlers/register-manually.md	⚠️Warning	View (>= odsp-graph-online)	Details
docs/rest-api/concepts/addressing-driveitems.md	⚠️Warning	View (>= odsp-graph-online)	Details
docs/rest-api/concepts/case-sensitivity.md	⚠️Warning	View (>= odsp-graph-online)	Details
docs/rest-api/concepts/custom-metadata-facets.md	⚠️Warning	View (>= odsp-graph-online)	Details
docs/rest-api/concepts/direct-endpoint-differences.md	⚠️Warning	View (>= odsp-graph-online)	Details
docs/rest-api/concepts/filtering-results.md	⚠️Warning	View (>= odsp-graph-online)	Details
docs/rest-api/concepts/http-verb-tunneling.md	⚠️Warning	View (>= odsp-graph-online)	Details
docs/rest-api/concepts/long-running-actions.md	⚠️Warning	View (>= odsp-graph-online)	Details
docs/rest-api/concepts/optional-query-parameters.md	⚠️Warning	View (>= odsp-graph-online)	Details
docs/rest-api/concepts/scan-guidance.md	⚠️Warning	View (>= odsp-graph-online)	Details
docs/rest-api/concepts/sharing.md	⚠️Warning	View (>= odsp-graph-online)	Details
docs/rest-api/concepts/special-folders-appfolder.md	⚠️Warning	View (>= odsp-graph-online)	Details
docs/rest-api/concepts/upload.md	⚠️Warning	View (>= odsp-graph-online)	Details
docs/rest-api/concepts/using-sharing-links.md	⚠️Warning	View (>= odsp-graph-online)	Details
docs/rest-api/concepts/using-webhooks.md	⚠️Warning	View (>= odsp-graph-online)	Details
docs/rest-api/concepts/webhook-receiver-validation-request.md	⚠️Warning	View (>= odsp-graph-online)	Details
docs/rest-api/concepts/working-with-cors.md	⚠️Warning	View (>= odsp-graph-online)	Details
CONTRIBUTING_QUICKSTART.md	✅Succeeded

docs/file-handlers/define-actions.md

• Line 5, Column 11: [Warning: ms-topic-invalid - See documentation] Invalid value for 'ms.topic': 'conceptual'.

docs/file-handlers/register-manually.md

• Line 2, Column 1: [Warning: title-missing - See documentation] Missing required attribute: 'title'. Add a title string to show in search engine results.
• Line 5, Column 11: [Warning: ms-topic-invalid - See documentation] Invalid value for 'ms.topic': 'conceptual'.
• Line 42, Column 29: [Warning: hard-coded-locale - See documentation] Link 'https://docs.microsoft.com/en-us/azure/active-directory/develop/reference-app-manifest' contains locale code 'en-us'. For localizability, remove 'en-us' from links to most Microsoft sites.
• Line 92, Column 111: [Warning: hard-coded-locale - See documentation] Link 'https://docs.microsoft.com/en-us/azure/databricks/dev-tools/api/latest/aad/' contains locale code 'en-us'. For localizability, remove 'en-us' from links to most Microsoft sites.
• Line 2, Column 1: [Suggestion: description-missing - See documentation] Missing required attribute: 'description'.
• Line 42, Column 29: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://docs.microsoft.com/en-us/azure/active-directory/develop/reference-app-manifest' will be broken in isolated environments. Replace with a relative link.
• Line 92, Column 111: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://docs.microsoft.com/en-us/azure/databricks/dev-tools/api/latest/aad/' will be broken in isolated environments. Replace with a relative link.

docs/rest-api/concepts/addressing-driveitems.md

• Line 5, Column 11: [Warning: ms-topic-invalid - See documentation] Invalid value for 'ms.topic': 'conceptual'.
• Line 2, Column 1: [Suggestion: description-missing - See documentation] Missing required attribute: 'description'.

docs/rest-api/concepts/case-sensitivity.md

• Line 5, Column 11: [Warning: ms-topic-invalid - See documentation] Invalid value for 'ms.topic': 'conceptual'.
• Line 2, Column 1: [Suggestion: description-missing - See documentation] Missing required attribute: 'description'.

docs/rest-api/concepts/custom-metadata-facets.md

• Line 5, Column 11: [Warning: ms-topic-invalid - See documentation] Invalid value for 'ms.topic': 'conceptual'.
• Line 14, Column 1: [Warning: hard-coded-locale - See documentation] Link 'https://learn.microsoft.com/en-us/graph/api/resources/onedrive' contains locale code 'en-us'. For localizability, remove 'en-us' from links to most Microsoft sites.
• Line 2, Column 1: [Suggestion: description-missing - See documentation] Missing required attribute: 'description'.
• Line 14, Column 1: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/en-us/graph/api/resources/onedrive' will be broken in isolated environments. Replace with a relative link.

docs/rest-api/concepts/direct-endpoint-differences.md

• Line 5, Column 11: [Warning: ms-topic-invalid - See documentation] Invalid value for 'ms.topic': 'conceptual'.
• Line 81, Column 27: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/entra/identity-platform/v2-overview' will be broken in isolated environments. Replace with a relative link.

docs/rest-api/concepts/filtering-results.md

• Line 5, Column 11: [Warning: ms-topic-invalid - See documentation] Invalid value for 'ms.topic': 'conceptual'.
• Line 2, Column 1: [Suggestion: description-missing - See documentation] Missing required attribute: 'description'.

docs/rest-api/concepts/http-verb-tunneling.md

• Line 5, Column 11: [Warning: ms-topic-invalid - See documentation] Invalid value for 'ms.topic': 'conceptual'.
• Line 2, Column 1: [Suggestion: description-missing - See documentation] Missing required attribute: 'description'.

docs/rest-api/concepts/long-running-actions.md

• Line 5, Column 11: [Warning: ms-topic-invalid - See documentation] Invalid value for 'ms.topic': 'conceptual'.

docs/rest-api/concepts/optional-query-parameters.md

• Line 5, Column 11: [Warning: ms-topic-invalid - See documentation] Invalid value for 'ms.topic': 'conceptual'.
• Line 2, Column 1: [Suggestion: description-missing - See documentation] Missing required attribute: 'description'.

This comment lists only the first 25 errors (including error/warning/suggestion) in the pull request.
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[GettingAdam]

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