add blockdiag

README.md

@@ -196,3 +196,5 @@ data or mind maps.
     * [Mindmap](examples/mindmap.md)
     * [Gantt Diagram](examples/gantt.md)
     * [Visualising Software Architecture with the C4 Model](examples/c4.md)
+* [Block Diagrams](examples/blockdiag.md)
+

examples/blockdiag.md

+# Block Diagram (blockdiag)
+
+```blockdiag
+blockdiag {
+  A -> B -> C -> D;
+  A -> E -> F -> G;
+}
+```