Added node creation by left-click, node drawing and first part of node creator panel drawing

src/graph/graph.py

@@ -10,7 +10,7 @@ class Graph:
         self.nodes: list[Node] = []
 
     def add_node(self, x: int, y: int) -> None:
-        self.nodes.append(Node(x, y))
+        self.nodes.append(Node(x, y, "NO NAME"))
 
     def add_edge(self, start_index: int, end_index: int, length: float) -> None:
         self.edges.append(Edge(start_index, end_index, length))