Add cargo project to the template

Author: rylev

Diff for: .gitignore

@@ -0,0 +1 @@
+/target

Diff for: Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "rust-codespaces"
+version = "0.1.0"
+authors = ["Ryan Levick <[email protected]>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

Diff for: src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}