add helloworld-rs

helloworld-rs/.gitignore

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+target/
+

helloworld-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 = "helloworld-rs"
+version = "0.1.0"

helloworld-rs/Cargo.toml

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+[package]
+name = "helloworld-rs"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

helloworld-rs/README.md

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+
+# helloworld-rs
+
+```sh
+cargo run
+```
+
+```sh
+cargo build --release
+./target/release/helloworld-rs
+``´

helloworld-rs/src/main.rs

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