Create A Chatting App
   Create the rails application     We are ready to create our new  rails  application:    rails new chatting_app     Note : We didn’t define a name for the application and rails will resolve it using the directory name:  chatting app   Rails will create all the application’s files and install the required gems.   Let’s start the application to make sure that everything if fine.    rails server     You should see something like:    => Booting Puma => Rails 5.2.3 application starting in development => Run `rails server -h` for more startup options Puma starting in single mode... * Version 3.12.1 (ruby 2.6.2-p47), codename: Llamas in Pajamas * Min threads: 5, max threads: 5 * Environment: development * Listening on tcp://localhost:3000 Use Ctrl-C to stop     Open a browser and visit  http://localhost:3000 , if you see this we are good to go.     Step-1(Add User Devise)   We are going to use the awesome  devise  solution for authentication.   Append t...