Add code for demonstrating loops

loops/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "loops"
+version = "0.1.0"

loops/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "loops"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

loops/src/main.rs

@@ -0,0 +1,5 @@
+fn main() {
+    loop {
+        println!("again!");
+    }
+}