Create naming best practices page

Naming is always the hardest thing but there are some established conventions for naming in the GraphQL community, see:

* https://benjie.dev/graphql/naming
* https://www.apollographql.com/docs/graphos/schema-design/guides/naming-conventions

Other languages also have their own code style/conventions:

* [Rust](https://doc.rust-lang.org/nightly/style-guide/)
* [Kotlin](https://kotlinlang.org/docs/coding-conventions.html)
* [Go](https://go.dev/doc/effective_go)

Feels like having official guidance on graphql.org would be a win for the community.