[rs] Create rust project

rs/.gitignore

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+/target

rs/Cargo.lock

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

rs/Cargo.toml

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+[package]
+name = "advent-of-code"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

rs/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}