Added getting started with instance mode file in mdx

[soumikadevarakonda]

Resolves #754

[ksen0]

Hi @soumikadevarakonda , thanks for your interest, however I will close this PR for now. I'll also make a comment on the original issue to clarify this task, because this PR offers a tutorial that is too high-level and does not use the existing resources or make them easier to understand.

For the future, please also read through the contributor guidelines:

You should not file a pull request (or start working on code changes) without a corresponding issue or before an issue has been approved for implementation; that is because the proposed fix may not be accepted, need a different approach entirely, or the actual problem is somewhere else. Any pull requests filed before the issue has been approved for fixing will be closed until approval is given to the issue.

In this case, if you want to work on this topic, please respond on the original issue and once there's agreement on task scope I'm happy to assign to you!