Add usage documentation to quinn/examples/server.rs

Author: jesselucas

quinn/examples/server.rs

@@ -1,3 +1,19 @@
+//! Example to serve files from a directory.
+//!
+//! Run:
+//! ```text
+//! $ RUST_LOG=debug cargo run --example server ./
+//! ```
+//!
+//! and in another terminal you can run the client example:
+//!
+//! Run:
+//! ```test
+//! $ cargo run --example client https://localhost:4433/Cargo.toml
+//! ```
+//!
+//! The output will be the source code of the Cargo.toml file.
+
 use std::{
     ascii, fs, io,
     net::SocketAddr,