Define graphql types

blog.graphqls

type Mutation{
    createUserInfo(input: CreateUserInfo!) : Boolean!
    authenticateUserInfo(input: AuthenticateUserInfo!): JwtResponse!
    createBlog(input: CreateBlog!) : Blog!
}
input CreateUserInfo{
    username: String!
    password: String!
    fullname: String!
}
input CreateBlog{
    title: String!
    content: String!
}
input AuthenticateUserInfo{
    username: String!
    password: String!
}
type JwtResponse{
    token: String!
}