Add cargo example project, update README & gitignore

.gitignore

@@ -0,0 +1,3 @@
+/.idea/
+/target/
+/Cargo.lock

Cargo.toml

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+[package]
+name = "cargo-hello-world"
+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

@@ -1,2 +1,13 @@
-# 02-cargo-hello-world
+# 02 - Cargo  hello world
 
+## Create cargo project
+
+```
+cargo new cargo-hello-world --bin
+```
+
+## Build & run
+
+```
+cargo run
+```

src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}