Implement Some Tokio Tutorials

Tutorial/ReadPart.rs

@@ -0,0 +1,17 @@
+#![allow(non_snake_case)]
+
+use tokio::fs::File;
+use tokio::io::{self, AsyncReadExt};
+
+#[tokio::main]
+async fn main() -> io::Result<()> {
+    let mut buffer = [1; 10];
+    let mut file = File::open("README.md").await?;
+
+    // read up to 10 bytes
+    let n = file.read(&mut buffer[..]).await?;
+
+    println!("The bytes: {:?}", &buffer[..n]);
+
+    Ok(())
+}