Add some basic examples

examples/application-example/lib/foobar.rb

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+require 'foobar/consumers'
+require 'foobar/version'
+
+module Foobar
+end

examples/application-example/lib/foobar/consumers.rb

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+require 'foobar/ping_consumer'
+require 'foobar/pong_consumer'

examples/application-example/lib/foobar/ping_consumer.rb

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+require 'bunnyrun'
+
+module Foobar
+  class PingConsumer < BunnyRun::Consumer
+    queue 'ping'
+
+    exchange 'ping-pong', type: :direct
+    bind 'ping-pong', routing_key: 'ping'
+
+    manual_ack true # default is false
+
+    def perform(message)
+      logger.info "#{self.class} received: #{message.payload}"
+      sleep 1
+
+      publish('ping-pong', 'PONG', routing_key: 'pong')
+      message.ack
+    end
+  end
+end

examples/application-example/lib/foobar/pong_consumer.rb

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+require 'bunnyrun'
+
+module Foobar
+  class PongConsumer < BunnyRun::Consumer
+    queue 'pong'
+
+    exchange 'ping-pong', type: :direct
+    bind 'ping-pong', routing_key: 'pong'
+
+    manual_ack true # default is false
+
+    def perform(message)
+      logger.info "#{self.class} received: #{message.payload}"
+      sleep 1
+
+      publish('ping-pong', 'PING', routing_key: 'ping')
+      message.ack
+    end
+  end
+end

examples/application-example/lib/foobar/version.rb

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+module Foobar
+  VERSION = '0.1.0'.freeze
+end