added basic test

examples/basic.rs

@@ -0,0 +1,24 @@
+extern crate binary_encode;
+extern crate serialize;
+
+#[deriving(Encodable, Decodable, PartialEq)]
+struct Entity {
+    x: f32,
+    y: f32,
+}
+
+#[deriving(Encodable, Decodable, PartialEq)]
+struct World {
+    entities: Vec<Entity>
+}
+
+fn main() {
+    let world = World {
+        entities: vec![Entity {x: 0.0, y: 4.0}, Entity {x: 10.0, y: 20.5}]
+    };
+
+    let encoded: Vec<u8> = binary_encode::encode(&world).unwrap();
+    let decoded: World = binary_encode::decode(encoded).unwrap();
+
+    assert!(world == decoded);
+}