public void Configure(IApplicationBuilder app, BookShopDbContext dbContext)
{
app.UseCors(builder => builder
.AllowAnyOrigin()
.AllowAnyHeader()
.AllowAnyMethod());
app.UseWebSockets();
app.UseGraphQLWebSockets <BookShopSchema>("/graphql");
app.UseGraphQL <BookShopSchema>();
app.UseGraphQLPlayground(new GraphQLPlaygroundOptions());
dbContext.SeedAsync().GetAwaiter().GetResult();
}