Add graphviz files

exercises/02/graphviz/1.1.dot

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+digraph finite_state_machine {
+    rankdir=LR;
+    size="8,5"
+
+    subgraph cluster_c2 {
+        label="Accepting"; graph[style = dotted];
+        node [shape = doublecircle];
+        3 -> 4 [label = "i"];
+        4 -> 3 [label = "o" constraint=false];
+    }
+
+    subgraph cluster_c1 {
+        label="Non-accepting"; graph[style = dotted];
+        node [shape = circle];
+        0 -> 1 [label = "c"];
+        1 -> 2 [label = "o"];
+        2 -> 2 [label = "o"];
+        2 -> 3 [label = "l"];
+    }
+
+    // Create an invisible point called START, so our starting state gets an arrow
+    node [shape=point];
+    START [style=invis];
+    START -> 0;
+}