Add how-to for the most typical scenario

[nojaf]

We should add a short guide on how to set up the most common scenario for people to use this tool.
We could benefit from a step-by-step guide on how to go from a first Markdown file in the docs folder to a published GitHub pages website.

Something along the lines of:

• Install the commandline tool
• Create the docs folder with a first index.md file.
• Update your Directory.Build.props file with some recommendations.
• Launch the tool locally to see what it looks like.
• Enable GitHub pages (screenshot)
• Create a GitHub Action yaml. (Build the docs, upload them as artifact, deploy the artifacts)
• Profit!

I think this could encourage more projects to add documentation.

[SchlenkR]

See here for a demo repo (PRs welcome):

https://github.com/RonaldSchlenker/FSDocsDemo

[nojaf]

This guide covers this: https://fsprojects.github.io/FSharp.Formatting/zero-to-hero.html