/health_check with integration test implemented

src/main.rs

@@ -0,0 +1,9 @@
+use std::net::TcpListener;
+
+use zero2prod::run;
+
+#[tokio::main]
+async fn main() -> std::io::Result<()> {
+	let listener = TcpListener::bind("127.0.0.1:8000").expect("Failed to bind random port");
+	run(listener)?.await
+}