Current Overrides.toml instructions do not work - update README

[hiemstar]

The content of the suggested Overrides.toml is not correct. I was getting an init-error, see
discourse.julialang. The solution of the issue is also there.

It would be good to update the README.

[barche]

Hi, I can't reproduce this, for me this overrides file works:

[3eaa8342-bff7-56a5-9981-c04077f7cee7]
libcxxwrap_julia = "C:/Users/user/source/repos/libcxxwrap-julia/build"

Can you please give the complete path to the libcxxwrap_julia.dll that is built? Note that you should use the latest libcxxwrap-julia main, this also works with Julia 1.7 now.