improve FSI error message about extensions
Open
Area-FSI
Feature Request
- Dominant language
- F#
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- Avg merge
- 4d 11h
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- 131
Description
#### Currently
```fsharp
#r "csc.exe: MyCode.cs";;
```
> error FS3216: Package manager key 'csc.exe' was not registered in [C:\Program Files\dotnet\sdk\5.0.100\FSharp; C:\Program Files\dotnet\sdk\5.0.100\FSharp\], []. Currently registered: nuget, paket
#### Proposing
I would like the error message to point at the [readme.md](https://github.com/dotnet/fsharp/blob/main/src/fsharp/Microsoft.DotNet.DependencyManager/README.md).
> error FS3216: Package manager key 'csc.exe' was not registered in [C:\Program Files\dotnet\sdk\5.0.100\FSharp; C:\Program Files\dotnet\sdk\5.0.100\FSharp\], []. Currently registered: nuget, paket.
> To learn more about extensions, visit: https://aka.ms/dotnetdepmanager
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