Cargo project, README & gitignore

.gitignore

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+/.idea
+/target
+/Cargo.lock

Cargo.toml

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+[package]
+name = "variables"
+version = "0.1.0"
+authors = ["Emilio González Montaña <emilio@ociotec.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

README.md

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+# 04 - Variables
+
+## Build & run
+
+```
+cargo run
+```

src/main.rs

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+fn main() {
+    let mut x = 45;
+    println!("The value of x is {}", x);
+    x = 60;
+    println!("The value of x is {}", x);
+}