Last chapter on async Rust

exercises/08_futures/00_intro/src/lib.rs

@@ -0,0 +1,14 @@
+fn intro() -> &'static str {
+    // TODO: fix me 👇
+    "I'm ready to _!"
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::intro;
+
+    #[test]
+    fn test_intro() {
+        assert_eq!(intro(), "I'm ready to learn about futures!");
+    }
+}