initial commit

exercises/05_ticket_v2/10_packages/src/main.rs

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+// This is a `main.rs` file, therefore `cargo` interprets this as the root of a binary target.
+
+// TODO: fix this broken import. Create a new library target in the `src` directory.
+//   The library target should expose a public function named `hello_world` that takes no arguments
+//   and returns nothing.
+use packages::hello_world;
+
+// This is the entrypoint of the binary.
+fn main() {
+    hello_world();
+}