Add a add_assets to the vs generator

[TNtube]

Is your feature request related to a problem? Please describe.

I faced a problem with the current vs solution generator, I couldn't see my assets folder (contening mainly images and glsl scripts)

Describe the solution you'd like

A add_assets function (or any name that sound better) to add any non project files in the VS solution hierarchy.

Describe alternatives you've considered

I'm currently using add_headerfiles, that is working in my case but feel more like a hack than anything.

Thanks you

Additional context

No response

[SirLynix]

Maybe we could reuse add_installfiles to include them in VS projects?

[waruqi]

try add_headerfiles("xxx.glsl")?

[TNtube]

That's currently what i'm doing and it works well, but I thought it was more a hack than a solution.

[Arthapz]

meson has "extra_files" to list them

[waruqi]

meson is just a project generator, so it can provide various special interfaces related to the project generator.

But project generator is only an optional plug-in for xmake, and I don't want to add a special api just for the features that project generator needs.

[waruqi]

May be we can add add_extrafiles for extra files. It will be used to support some of the following features.

1. Only show them in vs/vsxmake project generator, but they will be not installed.
2. ...

Only one case I can think of at the moment, but it's not enough to add an new api just for the vs project generator.

[waruqi]

I have added it. add_extrafiles("*.txt") #4104

xmake update -s dev

[SirLynix]

Awesome, thank you!