added build script

examples/test.rs

@@ -0,0 +1,6 @@
+extern crate vr;
+
+fn main() {
+    let vr = vr::IVRSystem::init().unwrap();
+    print!("{:?}", vr.bounds());
+}

src/sys/build.rs

@@ -0,0 +1,8 @@
+
+
+#[cfg(target_os="macos")]
+fn main() {
+    println!("cargo:rustc-link-search={}/../../openvr/bin/osx32", env!("CARGO_MANIFEST_DIR"));
+}
+
+//fn main() {}