initial commit

exercises/07_threads/00_intro/Cargo.toml

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+[package]
+name = "intro_07"
+version = "0.1.0"
+edition = "2021"

exercises/07_threads/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 build a concurrent ticket management system!"
+        );
+    }
+}