Added basic node system

Assets/Scripts/Network/NodeButton.cs

@@ -0,0 +1,43 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.InputSystem;
+
+public class NodeButton : MonoBehaviour
+{
+    public Node node;
+    public Node.Direction direction;
+    // Start is called before the first frame update
+    void Start()
+    {
+        if (node.connections[(int)direction] == null)
+        {
+            gameObject.GetComponent<Renderer>().material.color = Color.gray;
+            gameObject.GetComponent<Collider>().enabled = false;
+        }
+    }
+
+    private void FixedUpdate()
+    {
+
+        if (Mouse.current.leftButton.wasPressedThisFrame)
+        {
+            Ray ray = Camera.main.ScreenPointToRay(Mouse.current.position.ReadValue());
+            RaycastHit hit;
+
+            if (Physics.Raycast(ray, out hit))
+            {
+                if (hit.transform == gameObject.transform)
+                {
+                    Debug.Log(string.Format("Button down on {0}", direction));
+                    node.MoveToDirection(direction);    
+                }
+            }
+        }
+    }
+
+    private void OnMouseOver()
+    {
+       
+    }
+}