Add puma example.

examples/puma/application.rb

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+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require "async/container"
+require "console"
+
+# Console.logger.debug!
+
+class Application < Async::Container::Controller
+	def setup(container)
+		container.spawn(name: "Web") do |instance|
+			instance.exec("bundle", "exec", "puma", "-C", "puma.rb", ready: false)
+		end
+	end
+end
+
+Application.new.run

examples/puma/config.ru

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+run do |env|
+	[200, {"content-type" => "text/plain"}, ["Hello World"]]
+end

examples/puma/gems.locked

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+PATH
+  remote: ../..
+  specs:
+    async-container (0.18.3)
+      async (~> 2.10)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    async (2.21.1)
+      console (~> 1.29)
+      fiber-annotation
+      io-event (~> 1.6, >= 1.6.5)
+    console (1.29.2)
+      fiber-annotation
+      fiber-local (~> 1.1)
+      json
+    fiber-annotation (0.2.0)
+    fiber-local (1.1.0)
+      fiber-storage
+    fiber-storage (1.0.0)
+    io-event (1.7.5)
+    json (2.9.1)
+    nio4r (2.7.4)
+    puma (6.5.0)
+      nio4r (~> 2.0)
+    rack (3.1.8)
+
+PLATFORMS
+  ruby
+  x86_64-linux
+
+DEPENDENCIES
+  async-container!
+  puma
+  rack (~> 3)
+
+BUNDLED WITH
+   2.5.22

examples/puma/gems.rb

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+source "https://rubygems.org"
+
+gem "async-container", path: "../.."
+
+gem "puma"
+gem "rack", "~> 3"

examples/puma/puma.rb

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+on_booted do
+	require "async/container/notify"
+
+	notify = Async::Container::Notify.open!
+	notify.ready!
+end