Add Xargo and config and stuff

codecs/oxipng/tmp/lib.rs

@@ -0,0 +1,10 @@
+extern crate wasm_bindgen;
+
+use wasm_bindgen::prelude::*;
+use std::time::{Instant};
+
+#[wasm_bindgen]
+pub fn doit() -> u32 {
+  let start = Instant::now();
+  start.elapsed().as_secs() as u32
+}