Add bin and edit workflow

bin/gems/yell-2.2.2/examples/003.2-formatting-BasicFormat.rb

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+# encoding: utf-8
+
+require_relative '../lib/yell'
+
+puts <<-EOS
+
+# The basic formating string looks like: %l, %d: %m.
+
+logger = Yell.new STDOUT, format: Yell::BasicFormat
+logger.info "Hello World!"
+#=> "I, 2012-02-29T09:30:00+01:00 : Hello World!"
+#    ^  ^                          ^
+#    ^  ISO8601 Timestamp          Message
+#    Level (short)
+
+
+EOS
+
+puts "=== actual example ==="
+logger = Yell.new STDOUT, format: Yell::BasicFormat
+logger.info "Hello World!"
+