Implemented WindowsWindow and EventCallback

GlitchyEngine/src/WindowRectangle.bf

@@ -0,0 +1,23 @@
+using System;
+
+namespace GlitchyEngine
+{
+	[CRepr]
+	public struct WindowRectangle
+	{
+		public int32 X;
+		public int32 Y;
+		public int32 Width;
+		public int32 Height;
+
+		public this() => this = default;
+
+		public this(int32 x, int32 y, int32 width, int32 height)
+		{
+			X = x;
+			Y = y;
+			Width = width;
+			Height = height;
+		}
+	}
+}