initial commit

exercises/04_traits/00_intro/Cargo.toml

@@ -0,0 +1,4 @@
+[package]
+name = "intro_03"
+version = "0.1.0"
+edition = "2021"

exercises/04_traits/00_intro/src/lib.rs

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+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 traits!");
+    }
+}