[Feature Request] Add json schema

[mcm-ham]

It would be helpful if there's a JSON schema we could link to in our own schema for appsettings.json for intellisense and validation.

https://json.schemastore.org/appsettings

[Tdue21]

That would be awesome. I have almost given up on understanding this extension ;)

[rafaelsc]

JSON schema is merged to SchemaStore, and Visual Studio and VSCode should start validating and auto-completing the schema for Serilog.