Feature Request: Create code snippets

Something like https://github.com/hackmdio/vscode-hackmd/pull/24

Start by reading the issue's referenced pull request, https://github.com/hackmdio/vscode-hackmd/pull/24, to understand what “code snippets” means in this project. The issue does not name files, tests, entry points, or acceptance criteria, so the completed behavior must be clarified before implementation.

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