Create an MCP server template following package conventions

[joelverhagen]

We've completed a proposal for setting some conventions around MCP NuGet packages:
NuGet/Home#14344

We can ease the steps of setting up the .csproj by having a project template, perhaps shipping with https://www.nuget.org/packages/Microsoft.Extensions.AI.Templates.

The .csproj will have:

• McpServer package type
• ModelContextProtocol dependency
• PackAsTool
• server.json file packed into the .nupkg

It should be a "preview" template.

[joelverhagen]

I am interested in helping to contribute this if there is limited availability on your team.

[stephentoub]

cc: @jeffhandley

[jeffhandley]

Thanks, @joelverhagen. I will reach out to set up time to discuss this with you next week.

[joelverhagen]

@jeffhandley, I have made a draft PR so I could try and understand the space a bit more. It seems to be working okay locally.
#6547

I'd love to talk and answer some open questions. I'm sure I'm missing a lot :)

[joelverhagen]

The first cut is done. Follow-up work can be tracked by other issues.