Add bin and edit workflow

bin/gems/yell-2.2.2/examples/003.1-formatting-DefaultFormat.rb

@@ -0,0 +1,22 @@
+# encoding: utf-8
+
+require_relative '../lib/yell'
+
+puts <<-EOS
+
+# The default formatting string looks like: %d [%5L] %p : %m and is used when 
+# nothing else is defined.
+
+logger = Yell.new STDOUT, format: Yell::DefaultFormat
+logger.info "Hello World!"
+#=> "2012-02-29T09:30:00+01:00 [ INFO] 65784 : Hello World!"
+#    ^                         ^       ^       ^
+#    ISO8601 Timestamp         Level   Pid     Message
+
+
+EOS
+
+puts "=== actual example ==="
+logger = Yell.new STDOUT, format: Yell::DefaultFormat
+logger.info "Hello World!"
+