Is it possible to create a resolver without a query?

[Jacob-Mahoney]

Describe the Bug
Is it possible to create a resolver without a query? Whenever I try the following code, I get an error.

To Reproduce

@Resolver()
export class UserResolver {

    private manager: UserManager;

    constructor() {
        this.manager = new UserManager();
    }

    @Mutation(returns => Number)
    async createUser(@Arg("input") createUserInput: CreateUserInput): Promise<number> {
        let createdUserId = await this.manager.createUser(createUserInput);
        return createdUserId;
    }

}

Expected Behavior
To not get the following error: Type Query must define one or more fields.

Environment (please complete the following information):

• OS: Windows
• Node version: 14.15.4
• Package version: 1.1.1
• TypeScript version: 4.3.4

[MichalLytek]

In GraphQL spec, there must be at least one Query defined.
So in TypeGraphQL, you must have at least one @Resolver with one @Query defined.