Add a simple example.

examples/01-hello-world/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "hello-world"
+version = "0.1.0"
+authors = ["Dimitri Sabadie <dimitri.sabadie@gmail.com>"]
+
+[dependencies]
+splines = "0.1"

examples/01-hello-world/src/main.rs

@@ -0,0 +1,11 @@
+extern crate splines;
+
+use splines::{Interpolation, Key, Spline};
+
+fn main() {
+  let keys = vec![Key::new(0., 0., Interpolation::default()), Key::new(5., 1., Interpolation::default())];
+  let spline = Spline::from_vec(keys);
+
+  println!("value at 0: {}", spline.clamped_sample(0.));
+  println!("value at 3: {}", spline.clamped_sample(3.));
+}

examples/Cargo.toml

@@ -0,0 +1,8 @@
+[workspace]
+
+members = [
+  "01-hello-world"
+]
+
+[patch.crates-io]
+splines = { path = ".." }