Add curation for nuget Microsoft.Azure.Management.KeyVault

[boxofyellow]

The correct license is The MIT License (MIT) which can be found at https://raw.githubusercontent.com/Microsoft/dotnet/master/LICENSE

[clearlydefinedbot]

We discovered some errors in this curation when validating it:

= 0 licensed.declared with value "The MIT License (MIT)" is not SPDX compliant

[clearlydefinedbot]

We discovered some errors in this curation when validating it:

= 0 licensed.declared with value "The MIT License (MIT)" is not SPDX compliant

[boxofyellow]

Here is our references

<PackageVersion Include="Microsoft.Azure.Management.KeyVault" Version="[3.1.0]" />

Nuget url
https://www.nuget.org/packages/Microsoft.Azure.Management.KeyVault/3.1.0

that points at
https://raw.githubusercontent.com/Microsoft/dotnet/master/LICENSE

[dangoor]

The syntax here didn't work out as planned and I'm not sure a curation is needed here after all. I recommend we close this PR.