add support for german and add bibliography

bib.bib

@@ -0,0 +1,41 @@
+@misc{ref1,
+        author = "D.E. Knuth",
+        title = "Two notes on notation",
+        howpublished = "\url{http://www.example.com}"
+        year = "1992",
+}
+
+@misc{ref2,
+        author = "D.E. Knuth",
+        title = "Two notes on notation",
+        howpublished = "\url{http://www.example.com}"
+        year = "1992",
+}
+
+@misc{ref3,
+        author = "D.E. Knuth",
+        title = "Two notes on notation",
+        howpublished = "\url{http://www.example.com}"
+        year = "1992",
+}
+
+@misc{ref4,
+        author = "D.E. Knuth",
+        title = "Two notes on notation",
+        howpublished = "\url{http://www.example.com}"
+        year = "1992",
+}
+
+@misc{ref5,
+        author = "D.E. Knuth",
+        title = "Two notes on notation",
+        howpublished = "\url{http://www.example.com}"
+        year = "1992",
+}
+
+@misc{ref6,
+        author = "D.E. Knuth",
+        title = "Two notes on notation",
+        howpublished = "\url{http://www.example.com}"
+        year = "1992",
+}

main.tex

@@ -2,13 +2,15 @@
 
 \usetheme{metropolis}
 \usepackage{appendixnumberbeamer}
-
+\usepackage{hyperref}
 \usepackage{booktabs}
 \usepackage[scale=2]{ccicons}
 
 \usepackage{pgfplots}
 \usepgfplotslibrary{dateplot}
 
+\usepackage{ngerman}
+
 \usepackage{xspace}
 \newcommand{\themename}{\textbf{\textsc{metropolis}}\xspace}
 
@@ -54,7 +56,12 @@ Hallo Dies ist ein Test
 Hallo Dies ist ein Test
 \end{frame}
 
-
-
+\section{Referenzen}
+\begin{frame}{Referenzen}
+  \nocite{*}
+  \bibliographystyle{plain}
+  \bibliography{bib}
+  
+\end{frame}
 
 \end{document}