Start working on the control flow graphs post

Signed-off-by: Danila Fedorin <danila.fedorin@gmail.com>

content/blog/06_spa_agda_cfg/if-cfg.dot

@@ -0,0 +1,15 @@
+digraph G {
+    graph[dpi=300 fontsize=14 fontname="Courier New"];
+    node[shape=rectangle style="filled" fillcolor="#fafafa" penwidth=0.5 color="#aaaaaa"];
+    edge[arrowsize=0.3 color="#444444"]
+
+    node_begin [label="x = ...;\lx\l"]
+    node_then [label="x = 1\l"]
+    node_else [label="x = 0\l"]
+    node_end [label="y = x\l"]
+
+    node_begin -> node_then
+    node_begin -> node_else
+    node_then -> node_end
+    node_else -> node_end
+}