1. Create mutations to create a book and an author in the database.
   
2. Implement a request to get a list of books with authors. It is important to limit yourself to two queries to the database for one graphql query. For author use fieldResolver.
   
3. Tests:
   

• Creating an author
  
• Book creation
  
• Receive books without authors
  
• Receiving books with authors Graphql schema types:
  

type Book {
  bookId: number;   
  name: string;
  pageCount: number; 
  authorId: number;  
  author: Author; 
}


type Author {
  authorId: number;
  name: string;
} 

An example of a query to graphql:

query {
  books () {
    name
    author {
      name
    }
  }
}

To run JS - npm run start
To run TS - npm run startts