Add German translation of appendix a

Author: digitalcraftsman

de/ref.md

@@ -1,6 +1,6 @@
-# Appendix A References
+# Anhang A Literaturverzeichnis
 
-This book is a summary of my Go experience, some content are from other gophers' either blog or sites. Thanks them!
+Dieses Buch ist eine Zusammenfassung meiner Erfahrungen in Go. Einige Inhalte stammen aus den Blogs und Internetseiten von anderen Gophern. Vielen Dank an euch.
 
 1. [golang blog](http://blog.golang.org)
 2. [Russ Cox blog](http://research.swtch.com/)
@@ -10,4 +10,4 @@ This book is a summary of my Go experience, some content are from other gophers'
 6. [Go Programming Language](http://golang.org/doc/)
 7. [Network programming with Go](http://jan.newmarch.name/go/)
 8. [setup-the-rails-application-for-internationalization](http://guides.rubyonrails.org/i18n.html#setup-the-rails-application-for-internationalization)
-9. [The Cross-Site Scripting (XSS) FAQ](http://www.cgisecurity.com/xss-faq.html)
+9. [The Cross-Site Scripting (XSS) FAQ](http://www.cgisecurity.com/xss-faq.html)