Implement Some Tokio Tutorials

Tutorial/WriteFile.rs

@@ -0,0 +1,13 @@
+#![allow(non_snake_case)]
+
+use tokio::fs::File;
+use tokio::io::{self, AsyncWriteExt};
+
+#[tokio::main]
+async fn main() -> io::Result<()> {
+    let mut buffer = File::create("File.txt").await?;
+
+    buffer.write_all(b"some bytes").await?;
+
+    Ok(())
+}