Finished set up of CityGenWindow class + did some testing with UI + started on...

Finished set up of CityGenWindow class + did some testing with UI + started on generalizing the City Selection Menu

Assets/Scripts/Editor/CityGenWindow.cs

-using System.Collections;
-using System.Collections.Generic;
-using UnityEngine;
+using UnityEngine;
+using UnityEditor;
 
-public class CityGenWindow : MonoBehaviour {
+public class CityGenWindow : EditorWindow
+{
+	string saveFolder = Application.persistentDataPath + "/CityData";
+	bool citySelectionMenuEnabled = true;
+	Vector2 citySelectionMenuScrollPosition;
 
-	// Use this for initialization
-	void Start () {
+	public void OnGUI()
+	{
+		MakeCitySelectionMenu();
+	}
 
+	private void MakeCitySelectionMenu()
+	{
+		this.citySelectionMenuScrollPosition = GUILayout.BeginScrollView(this.citySelectionMenuScrollPosition, GUILayout.Width(100), GUILayout.Height(100));
+			for(int i = 0; i < 5; i++)
+				if (GUILayout.Button("City " + i))
+					Debug.Log("Clicked on: City " + i);
+		GUILayout.EndScrollView();
 	}
 
-	// Update is called once per frame
-	void Update () {
+// ######### Container Classes #########
+
+	private class CityEntry
+	{
+		string cityName;
+		string filename;
+	}
+
+
 
+	// Menu entry
+	[MenuItem ("Window/City Gen")]
+	public static void ShowWindow()
+    {
+        //Show existing window instance. If one doesn't exist, make one.
+        EditorWindow.GetWindow<CityGenWindow>("City Gen");
     }
 }