If you dont need any introduction, readme etc, the best option is to create a DMG.
You don’t need any external tools for this.
- Copy your app to a new folder.
- Open Disk Utility -> File -> New Image -> Image From Folder.
- Select the folder where you have placed the App. Give a name for the DMG and save. This creates a distributable image for you.
If needed you can add a link to applications to DMG. It helps user in installing by drag and drop.