Add JuliaFormatter toml generator (maybe consistent with "code style")

[jlperla]

Now that the VS Code has moved to JuliaFormatter.jl, I would be great for a template plugin to generate files to support it (including your beloved style = "blue"!)

It seems the architecture is to remove all formatting in the vscode extension itself, and do all formatting configuration in a
.JuliaFormatter.toml file (cc @pfitzseb). Which I fully agree with! That means it is especially helpful to generate these files for new users.

The minimum configuration of a plugin to the PkgTemplates is to generate a file with style = "blue", ="default" or ="yas". Personally that is enough for my purposes since I think that users can then modify it directly since it would be created in the correct place. But to get fancy you could add in https://github.com/domluna/JuliaFormatter.jl/#formatting-options as well.

BTW, my hope is to add this into the https://julia.quantecon.org/software_engineering/testing.html#project-setup docs so that introductory users get in the habit of always using code formatting/code styles.

[nickrobinson251]

Sure, I think a JuliaFormatter <: Plugin would be a great addition!

[gdalle]

Duplicate of #324

[gdalle]

BTW, my hope is to add this into the https://julia.quantecon.org/software_engineering/testing.html#project-setup docs so that introductory users get in the habit of always using code formatting/code styles.

I'm currently on a rampage of PkgTemplates PRs to help people get started with good coding practices. See #415 about my dreams for the runtests.jl file. If you have other similar ideas @jlperla, I'll take 'em!

[nickrobinson251]

closed by #412