Add bin and edit workflow

bin/gems/yell-2.2.2/examples/002.2-log-level-on-certain-severities-only.rb

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+# encoding: utf-8
+
+require_relative '../lib/yell'
+
+puts <<-EOS
+
+# The Yell::Level parser allows you to exactly specify on which levels to log, 
+# ignoring all the others. For instance: If we want to only log at the :debug 
+# and :warn levels we simply providing an array:
+# * %i[] is a built-in for an array of symbols
+
+logger = Yell.new STDOUT, level: %i[debug warn]
+
+%i[debug info warn error fatal].each do |level| 
+  logger.send( level, level )
+end
+#=> "2012-02-29T09:30:00+01:00 [DEBUG] 65784 : debug"
+#=> "2012-02-29T09:30:00+01:00 [ WARN] 65784 : warn"
+
+
+EOS
+
+puts "=== actual example ==="
+logger = Yell.new STDOUT, level: %i[debug warn]
+
+%i[debug info warn error fatal].each do |level| 
+  logger.send( level, level )
+end
+