Add few sentences on setup

[amanmdesai]

Some of the points mentioned in the section "Getting started with C++" could be summarized and added in the setup?

[welcome]

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[stale]

This issue or pull request has been automatically marked as stale because it has not had recent activity. Please manually close it, if it is no longer relevant, or ask for help or support to help getting it unstuck. Let me bring this to the attention of @klieret @wdconinc @michmx for now.