Add print_out example

lib/examples/print_out.rs

@@ -0,0 +1,30 @@
+use std::time::Duration;
+
+use tokio::time::sleep;
+use watchexec::{
+	config::{InitConfigBuilder, RuntimeConfigBuilder},
+	Watchexec,
+};
+
+// Run with: `env RUST_LOG=debug cargo run --example print_out`
+#[tokio::main]
+async fn main() -> color_eyre::eyre::Result<()> {
+	tracing_subscriber::fmt::init();
+	color_eyre::install()?;
+
+	let init = InitConfigBuilder::default()
+		.error_handler(Box::new(|err| async move {
+			eprintln!("Watchexec Runtime Error: {}", err);
+			Ok::<(), std::convert::Infallible>(())
+		}))
+		.build()?;
+
+	let runtime = RuntimeConfigBuilder::default().build()?;
+
+	let wx = Watchexec::new(init, runtime)?;
+	wx.main();
+
+	sleep(Duration::from_secs(1)).await;
+
+	Ok(())
+}