Publish Comprehensive Rust 🦀

src/hello-world/small-example.md

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+# Small Example
+
+Here is a small example program in Rust:
+
+```rust,editable
+fn main() {              // Program entry point
+    let mut x: i32 = 6;  // Mutable variable binding
+    print!("{x}");       // Macro for printing, like printf
+    while x != 1 {       // No parenthesis around expression
+        if x % 2 == 0 {  // Math like in other languages
+            x = x / 2;
+        } else {
+            x = 3 * x + 1;
+        }
+        print!(" -> {x}");
+    }
+    println!();
+}
+```
+