[add] new example

Signed-off-by: PythonShell <pythonshell@yeah.net>

Author: PythonShell

_static/examples/graph07.dot

@@ -0,0 +1,11 @@
+digraph G {
+    node [shape=box];
+    c1:n -> d1 [label=n];
+    c2:ne -> d2:ne [label=ne];
+    c3:e -> d3:ne [label=e];
+    c4:se -> d4:n [label=se];
+    c5:s -> d5:n [label=s];
+    c6:sw -> d6:n [label=sw];
+    c7:w -> d7:nw [label=w];
+    c8:nw -> d8:nw[label=nw];
+}