Add macOS app icon and bundle workflow

README.md

@@ -116,6 +116,18 @@ cargo build --package ironstorage-desktop
 cargo build --package ironstorage-desktop --release
 ```
 
+On macOS, install `cargo-packager` once, then build an application bundle or
+install the release bundle directly into `~/Applications`:
+
+```sh
+cargo install cargo-packager --locked
+cargo bundle-macos
+cargo bundle-macos --out-dir "$HOME/Applications"
+```
+
+The first bundle command writes `target/release/IronStorage.app`. The install
+form replaces `~/Applications/IronStorage.app` with the freshly built bundle.
+
 Build only the shared storage library or the Rust Apple bridge:
 
 ```sh