Setup library for future examples

Cargo.toml

@@ -6,3 +6,5 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+
+[dev-dependencies]

examples/hello.rs

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