> gem install bundler Create a file named Gemfile in the root of your app specifying what gems are required to run it: source "https://rubygems.org" gem 'sinatra', '4.0' Add this file to the git repository since it’s part of the app. Also add the .bundle directory to your .gitignore file. After adding the Gemfile, it makes it easy for other developers to get their environment ready to run the app:
