Add bin and edit workflow

bin/gems/yell-2.2.2/examples/003.3-formatting-ExtendedFormat.rb

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+# encoding: utf-8
+
+require_relative '../lib/yell'
+
+puts <<-EOS
+
+# The extended formatting string looks like: %d [%5L] %p %h : %m.
+
+logger = Yell.new STDOUT, format: Yell::ExtendedFormat
+logger.info "Hello World!"
+#=> "2012-02-29T09:30:00+01:00 [ INFO] 65784 localhost : Hello World!"
+#    ^                          ^      ^     ^           ^
+#    ISO8601 Timestamp          Level  Pid   Hostname    Message
+
+
+EOS
+
+puts "=== actual example ==="
+logger = Yell.new STDOUT, format: Yell::ExtendedFormat
+logger.info "Hello World!"
+