rails new plugin, see readme for command

lib/merged.rb

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+require "merged/version"
+require "merged/engine"
+
+module Merged
+  # Your code goes here...
+end

lib/merged/engine.rb

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+module Merged
+  class Engine < ::Rails::Engine
+    isolate_namespace Merged
+  end
+end

lib/merged/version.rb

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+module Merged
+  VERSION = "0.1.0"
+end

lib/tasks/merged_tasks.rake

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+# desc "Explaining what the task does"
+# task :merged do
+#   # Task goes here
+# end