Function me 

pub async fn me(
    client: &mut BoxClient<'_>,
    fields: Option<Vec<String>>,
) -> Result<UserFull, BoxAPIError>

Retrieves information about the user who is currently authenticated.
In the case of a client-side authenticated OAuth 2.0 application this will be the user who authorized the app.
In the case of a JWT, server-side authenticated application this will be the service account that belongs to the application by default.
Use the As-User header to change who this API call is made on behalf of.

Sample usage:

use rusty_box::{Config, DevAuth, BoxClient,BoxAPIError, users_api};

use dotenv;
use std::env;

 #[tokio::main]
async fn main() -> Result<(), BoxAPIError> {

    dotenv::from_filename(".dev.env").ok();
    let access_token = env::var("DEVELOPER_TOKEN").expect("DEVELOPER_TOKEN must be set");

    let config = Config::new();
    let auth = DevAuth::new(
        config,
        access_token,
    );
    let mut client = BoxClient::new(Box::new(auth));
     
    let me = users_api::me(&mut client, None).await?;
    println!("Me:{:#?}", me);

    Ok(())
}