Add an assembly icon; strange as it may seem, but this resolved the "cannot find AssymblyInfo.fs" error that occurred from time to time

[abelbraaksma]

It's certainly possible that one is unrelated to another. But when building in Visual Studio 2022, from time to time, a dozen of the following errors occurred:

Error FS0225 Source file 'D:\Projects\OpenSource\Abel\TaskSeq\src\FSharpy.TaskSeq\obj\Debug\net6.0\FSharpy.TaskSeq.AssemblyInfo.fs' could not be found

Even though the project compiled and ran fine. This post hinted at the cause, though I'm fully aware it may be unrelated: https://stackoverflow.com/questions/6494691/source-file-properties-assemblyinfo-cs-could-not-be-found

So, the absence of AssemblyInfo.fs is by design. Though I kind liked the old approach. Anyway, I wasn't the only one surprised by this: dotnet/fsharp#5309

The issue remains though, that the above error appears from time to time, which seems to me like some sort of synchronization bug between the autogenerated file from fsproj and the MSBuild compiler. Let's see if this hack solves it. It is nice to have some icon anyway.