add graph loading

app.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+
+import igraph as ig
+
+
+def read_graph(graph_file: str = 'valos_halozat_formatted.txt') -> ig.Graph:
+    with open(graph_file) as f:
+        vertices = int(f.readline())
+        edges = int(f.readline())
+        result_graph: ig.Graph = ig.Graph(vertices)
+        for _ in range(edges):
+            line = f.readline().split('')
+            result_graph.add_edge(int(line[0]), int(line[1]))
+    return result_graph
+
+
+if __name__ == "__main__":
+    read_graph()