Set up Cargo workspace with hello and variables examples

crates/01-hello/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "hello"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

crates/01-hello/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Nazdar!");
+}