Update README.md

README.md

 # Productspecificaties
 
 Specificaties van de te beheren producten
+
+```blockdiag
+blockdiag {
+  blockdiag -> generates -> "block-diagrams";
+  blockdiag -> is -> "very easy!";
+
+  blockdiag [color = "greenyellow"];
+  "block-diagrams" [color = "pink"];
+  "very easy!" [color = "orange"];
+}
+```