Officail support / Documentation of Sort

[Fitmavincent]

**The Problem: **
I've been looking around for a solution of sort in the official documentation, but I don't seem to find it.

**Possible solutions: **
After some Googling and found this post on Stack Overflow.

Stack Overflow: laravel-lighthouse-graphql-sorting-on-server-side

It works for me, but I'm not sure what's Repo owner/contributor on this. If this is by designed, can we make this into the official documentation?

Here's a quick look of the solution answer by: thekeymaster

type Query {
    user(firstName: String @eq orderBy: [OrderByClause!] @orderBy): [User!]! @paginate(type: "paginator" model: "App\\User")
}

type User {
    id: ID!
    firstName: String!
    lastName: String!
    birthDate: DateTime!
    email: String!
    created_at: DateTime!
    updated_at: DateTime!
}

input OrderByClause{
    field: String!
    order: SortOrder!
}

enum SortOrder {
    ASC
    DESC
}

query {
  user(count:20, firstName:"Foo", orderBy: [
        {
          field: "birthDate"
          order: DESC
        }
    ]) {
    data {
      name
      region
      birthDate
    }
  }
}

[spawnia]

@orderBy is the blessed solution, can you add a PR with a small section about it to https://github.com/nuwave/lighthouse/blob/master/docs/master/eloquent/getting-started.md?