Added placing buildings

Assets/Scripts/Game/Buildings/BuildingManager.cs

@@ -0,0 +1,46 @@
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace Fruitomation.Game
+{
+    public class BuildingManager : MonoBehaviour
+    {
+        private class BuildingInfo
+        {
+            public BuildingInfo(BuildingBase b, RectTransform rt)
+            {
+                Building = b;
+                Rect = rt;
+            }
+
+            public BuildingBase Building { get; }
+            public RectTransform Rect { get; }
+        }
+
+        private bool[,] InhabitedCells { get; } = new bool[96, 49];
+        private List<BuildingInfo> Buildings { get; } = new();
+
+        public bool AddBuildingAt(Vector2Int position, GameObject prefab, bool updateCellMap = false)
+        {
+            GameObject go = Instantiate(prefab, transform);
+            BuildingInfo info = new
+            (
+                go.GetComponent<BuildingBase>(),
+                go.GetComponent<RectTransform>()
+            );
+
+            Vector2Int p0 = position * 40;
+            Vector2Int p1 = p0 + new Vector2Int(20, 100);
+            
+            Vector2 off0 = info.Building.SizeOnGrid - Vector2.one;
+            Vector2 off1 = off0 * 20;
+
+            info.Rect.sizeDelta = info.Building.SizeOnGrid * 40;
+            info.Rect.anchoredPosition = p1 + off1;
+
+            Buildings.Add(info);
+            return true;
+        }
+    }
+}