Set windows app icon (just for exe)

build.rs

@@ -0,0 +1,7 @@
+fn main() {
+    if std::env::var("CARGO_CFG_TARGET_OS").unwrap() == "windows" {
+        let mut res = winresource::WindowsResource::new();
+        res.set_icon("assets/Icon.ico");
+        res.compile().unwrap();
+    }
+}