Instructions to integrate VSCode snippets for easier MCS-related manifest creation

[npintaux]

I am adding here a few VSCode snippets that I am currently using to speed up creating manifests for MCS. To be discussed where in the doc site we want to integrate those.

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• :x: The commit (48ff8416cb5876df9bddbd641ee4a877c83db7da). This user is missing the User's ID, preventing the EasyCLA check. Consult GitHub Help to resolve.For further assistance with EasyCLA, please submit a support request ticket.

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[npintaux]

closing this PR as I used an unverified user for my commits :( (wrong workstation)