As @AmadeusW commented in #3, what is the point of this repository? Based on its name and description, it sounds like it should be a starting point for developing a new analyzer. I..e, that instead of using VS’s templates mechanism, I would just clone this and start writing my analyzer. Then when things like nuget references need to be updated, I would just merge in changesets from this repository instead of doing that in my own. Except, as @AmadeusW said, this project also seems to act like it’s trying to be a repository of analyzers themselves instead of just a seed repo.

Where’s this seed repo we want?

Having the following expression:

var obj = new GetSome();
if (!(obj is null))
{
}

I'm getting a suggestion:

Statement must not use unnecessary parenthesis.

Removing the parenthesis:

var obj = new GetSome();
if (!obj is null)
{
}

leads to a compiler error:

Error CS0023 Operator '!' cannot be applied to operand of type 'Foo'

The version I'm using:

<PackageReference Include="StyleCop.Analyzers" Version="1.0.2" PrivateAssets="All" />

First of all. Great template is really useful to start
I have a big issue with it currently, the issue is 'how to treat settings/configuration required for the analyzer'. This is not straight forward:
For the nuget it can be an additional file declared at the .nuspec, currently I have:

<file src="configuration\Files\*.json" target="content\" />

But this wont work at the level of an analyzer as a VSIX extension. Any general guidelines for analyzer configuration?