Add a package for demonstrating modules

backyard/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "backyard"
+version = "0.1.0"

backyard/Cargo.toml

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+[package]
+name = "backyard"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

backyard/src/garden.rs

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+pub mod vegetables;

backyard/src/garden/vegetables.rs

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+#[derive(Debug)]
+pub struct Asparagus {}

backyard/src/main.rs

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+use crate::garden::vegetables::Asparagus;
+
+pub mod garden;
+
+fn main() {
+    let plant = Asparagus {};
+    println!("I'm growing {plant:?}!");
+}