Set LSApplicationCategoryType to public.app-category.games for macOS apps

By default Electron uses the developer tools category
Most packaged projects are games
In the future, this should be configurable

src/packager/packager.js

@@ -143,6 +143,10 @@ const CFBundleExecutable = 'CFBundleExecutable';
 const CFBundleVersion = 'CFBundleVersion';
 const CFBundleShortVersionString = 'CFBundleShortVersionString';
 
+// Describes the category of the app
+// https://developer.apple.com/documentation/bundleresources/information_property_list/lsapplicationcategorytype
+const LSApplicationCategoryType = 'LSApplicationCategoryType';
+
 class Packager extends EventTarget {
   constructor () {
     super();
@@ -276,7 +280,10 @@ class Packager extends EventTarget {
 
       // For simplicity, we'll set these to the same thing
       [CFBundleVersion]: this.options.app.version,
-      [CFBundleShortVersionString]: this.options.app.version,  
+      [CFBundleShortVersionString]: this.options.app.version,
+
+      // Most items generated by the packager are games
+      [LSApplicationCategoryType]: 'public.app-category.games'
     };
   }