Created Hello world.

the_first/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "the_first"
+version = "0.1.0"

the_first/Cargo.toml

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

the_first/src/main.rs

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+fn main() {
+    // ! means that println is a macro. Macros are used to handle token streams.
+    println!("Hello, world!");
+}