Documentation for `@Info` decorator

When trying to figure out how to get information about a request (like which fields are being requested), I searched through documentation but didn't find anything. On Stack Overflow I found out about the `@Info` decorator, but I'm not seeing where that's described.

Is information about `@Info` hard to find or is it undocumented?

The issue names the undocumented @Info decorator but does not mention a documentation file, test, or entry point. Locate the existing TypeGraphQL documentation for decorators and determine where @Info should be described; done means users can find its purpose and learn how to use it for request information.

Written by the indexing model from the issue text.