Add two PDF documents (#8)

Author: LaurenzV

files/images/diagrams.pdf

@@ -100,11 +100,13 @@ files! {
     "images/chinese.svg",
     "images/cylinder.svg",
     "images/diagram.svg",
+    "images/diagrams.pdf",
     "images/docs.svg",
     "images/f2t.jpg",
     "images/glacier.jpg",
     "images/graph.png",
     "images/logo.svg",
+    "images/matplotlib.pdf",
     "images/molecular.jpg",
     "images/monkey.svg",
     "images/pattern.svg",