WSL2 support

[AlterionX]

Issue

A request for a portion of the readme that details how to set up Vulkano in WSL2.

I have a working Vulkan setup (though I haven't run through an actual Vulkano application yet) w/ mesa (+ dozen), VcXsrv on the actual (hosting?) machine (Windows side), and probably weston on the WSL2 side. I was wondering if that's reasonable to add to the README or if it's excluded for some specific reason.

[ryco117]

I use WSL2 for my Rust setup and for Vulkano what I do is add to my .cargo/config.toml the following:

[build]
target = "x86_64-pc-windows-gnu"

This sets the default cargo build toolchain for the project to Windows 64-bit, which results in building a native Win64 .exe which can be run from either the WSL environment or copied back to Windows.