install.tar.gz location is wrongly documented

[lukka]

repro:
clone the repro,
open the solution,
build the x64 configuration

expected:
build succeeds

observed:
build fails with:
2>\MSBuild\Current\Bin\Microsoft.Common.CurrentVersion.targets(4651,5): error MSB3030: Could not copy the file "D:\repos\WSL-DistroLauncher\x64\install.tar.gz" because it was not found.

Notes:
The file install.tar.gz is requested to be under the WSL-DistroLauncher\x64
The readme.md tells to put it into the root of the project, i.e. /WSL-DistroLauncher/

[greg-hellings]

You can add, as a pre-build event, copy $(SolutionDir)\install.tar.gz $(SolutionDir)$(Platform), and the solution will do the needful during build.