Control custom title bar using store value

app/store.js

@@ -0,0 +1,9 @@
+const Store = require('electron-store');
+const store = new Store();
+
+if (store.has('drawCustomTitleBar') !== true) {
+  // Default to false if on MacOS, otherwise true
+  store.set('drawCustomTitleBar', (process.platform !== 'darwin') ? true : false)
+}
+
+module.exports.store = store