Last chapter on async Rust

exercises/08_futures/08_outro/src/lib.rs

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+// This is our last exercise. Let's go down a more unstructured path!
+// Try writing an **asynchronous REST API** to expose the functionality
+// of the ticket management system we built throughout the course.
+// It should expose endpoints to:
+//  - Create a ticket
+//  - Retrieve ticket details
+//  - Patch a ticket
+//
+// Use Rust's package registry, crates.io, to find the dependencies you need
+// (if any) to build this system.