Implement Some Tokio Tutorials

Tutorial/ReadFile.rs

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+#![allow(non_snake_case)]
+
+use tokio::fs::File;
+use tokio::io::{self, AsyncReadExt};
+
+#[tokio::main]
+async fn main() -> io::Result<()> {
+    let mut buffer = Vec::new();
+    let mut file = File::open("README.md").await?;
+
+    // read the whole file
+    file.read_to_end(&mut buffer).await?;
+
+    println!("The bytes: {:?}", &buffer);
+
+    Ok(())
+}