I need a simple like system for a web app. The UI it's already done, we just need the function so with a click you can like and with another click you can unlike the post. It must remember that the user has already like a post, this is important. I would prefere not to use PHP but as i am not an expert i am giving to you the choice of what language to use to achieve my goal. I will provide a folder with the site in html/css/js.