added Cosmos DB guidance

[kovarikthomas]

Overview/Summary

This PR adds service guidance for Azure Cosmos DB. The guidance has been reviewed and approved by engineering.

Related ADO item id: 27706

This PR fixes/adds/changes/removes

1. Adds service guidance for Azure Cosmos DB

Breaking Changes

None

As part of this Pull Request I have

• Read the Contribution Guide and ensured this PR is compliant with the guide
• Checked for duplicate Pull Requests
• Associated it with relevant GitHub Issues or ADO Work Items (Internal Only)
• Ensured my code/branch is up-to-date with the latest changes in the main branch
• Ensured PR tests are passing
• Updated relevant and associated documentation (e.g. Contribution Guide, Docs etc.)

[lachaves]

@kovarikthomas, can you please fix some "Wrong line endings" and "Trailing whitespace" errors reported by lint code check.

[kovarikthomas]

@lachaves That's done, all linting checks are passing now.

[lachaves]

@kovarikthomas, I was able to run hugo server and validate content and links.
The only thing we need to change is the State, as we are using only Preview for now (not using Verified for now). Can you please change the state for all from Verified to Preview so we can approve, merge and close?

[kovarikthomas]

@lachaves I have reverted all states to preview. Please approve and merge. Thanks!

[lachaves]

Ran hugo server, validated links, content, looks good to me.