Rustbook up through ch03-01

rustbook/.gitignore

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+*/target/
+*/Cargo.lock

rustbook/variables/Cargo.toml

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+[package]
+name = "variables"
+version = "0.1.0"
+authors = ["Dan Buch <daniel.buch@gmail.com>"]
+
+[dependencies]

rustbook/variables/src/main.rs

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+fn main() {
+    let mut x = 5;
+    println!("The value of x is: {}", x);
+    x = 6;
+    println!("The value of x is: {}", x);
+}