Initial project structure with some barebones layout, CSS and JS from game-data

Gemfile

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+source 'https://rubygems.org'
+
+gem 'sinatra', '~> 4.1'
+gem 'sinatra-contrib', '~> 4.1'
+gem 'puma', '~> 6.6'
+
+gem 'logger'
+
+group :development, :test do
+  gem 'rerun'
+  gem 'wdm', '>= 0.1.0' if Gem.win_platform?
+
+  # rubocop and extensions for code style
+  gem 'rubocop'
+  gem 'rubocop-rspec'
+end
+
+group :test do
+  gem 'rspec'
+  gem 'rack-test'
+end