How would you develop a new microservice with a single entity Book step by step?

1. Define the structure of the Book entity, for example, with fields: ID, Title, Author, PublishedYear.

2. Create a structure in Go for Book:

type Book struct {
    ID            string
    Title         string
    Author        string
    PublishedYear int
}

3. Design the API of the microservice: methods for creating, retrieving, updating, and deleting a book (CRUD).

4. Choose a data storage method (e.g., database or in-memory for simplicity).

5. Implement HTTP request handlers for each API method.

6. Set up routing to handle requests.

7. Add input validation.

8. Write tests for the main functions.

9. Run the service and verify its operation via Postman or curl.

10. If necessary, add logging and error handling.