Preamble - How to install software with cabal-install

[JonathanLorimer]

file to edit: https://github.com/haskell/cabal-userguide/blob/main/src/preamble/04_how_to_install_software_with_cabal-install.md

Brief Summary

This issue was added because of discussion on the initial content ideation issue (starting here). This is an important subject, because users often do want to install software without having to understand anything about packaging software. This section should explain how to install software with the cabal-install cli.

Resources

Installing packages The install command