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))

src/graph/node.py

@@ -1,4 +1,5 @@
 class Node:
-    def __init__(self, x: int, y: int):
+    def __init__(self, x: int, z: int, name: str):
         self.x: int = x
-        self.y: int = y
+        self.z: int = z
+        self.name: str = name