feat(example): add example app and blog app with demos

examples/blog/app.rb

@@ -0,0 +1,23 @@
+require 'prism'
+
+APP_ROOT = __dir__
+
+Prism::Orm.connect(File.join(APP_ROOT, 'db', 'development.pstore'))
+Prism::Orm.migrator(File.join(APP_ROOT, 'db', 'migrate')).migrate!
+
+Prism::Controller.views_root(File.join(APP_ROOT, 'app', 'views'))
+Prism::Controller.layout(:application)
+
+Dir[File.join(APP_ROOT, 'app', 'models', '*.rb')].sort.each { |file| require file }
+Dir[File.join(APP_ROOT, 'app', 'controllers', '*.rb')].sort.each { |file| require file }
+
+class Blog < Prism::Application
+  set :views, File.join(APP_ROOT, 'app', 'views')
+  enable_sessions(secret: 'blog-demo-secret')
+  use Prism::Middleware::Logger
+  use Prism::Middleware::ParamsParser
+  use Prism::Middleware::Static, root: File.join(APP_ROOT, 'public')
+
+  root(to: 'posts#index')
+  resources :posts, only: %i[index show create]
+end