first commit

Core/Collections/IMap.cs

@@ -0,0 +1,12 @@
+namespace Just.Core.Collections;
+
+public interface IMap<T> : IReadOnlyCollection<MapPoint<T>>
+{
+    int Width { get; }
+    int Height { get; }
+    ref readonly T this[int x, int y] { get; }
+    ref readonly T this[double x, double y] { get; }
+    MapPoint<T> Get(int x, int y);
+    MapPoint<T> Get(double x, double y);
+    T[,] ToArray();
+}