Add GetWindowSize() function

src/raylib.h

@@ -973,6 +973,7 @@ RLAPI int GetMonitorPhysicalWidth(int monitor);                   // Get specifi
 RLAPI int GetMonitorPhysicalHeight(int monitor);                  // Get specified monitor physical height in millimetres
 RLAPI int GetMonitorRefreshRate(int monitor);                     // Get specified monitor refresh rate
 RLAPI Vector2 GetWindowPosition(void);                            // Get window position XY on monitor
+RLAPI Vector2 GetWindowSize(void);                                // Get window size on monitor
 RLAPI Vector2 GetWindowScaleDPI(void);                            // Get window scale DPI factor
 RLAPI const char *GetMonitorName(int monitor);                    // Get the human-readable, UTF-8 encoded name of the specified monitor
 RLAPI void SetClipboardText(const char *text);                    // Set clipboard text content

src/rcore.c

@@ -1972,6 +1972,17 @@ Vector2 GetWindowPosition(void)
     return (Vector2){ (float)x, (float)y };
 }
 
+// Get window size on monitor
+Vector2 GetWindowSize(void)
+{
+    int x = 0;
+    int y = 0;
+#if defined(PLATFORM_DESKTOP)
+    glfwGetWindowSize(CORE.Window.handle, &x, &y);
+#endif
+    return (Vector2){ (float)x, (float)y };
+}
+
 // Get window scale DPI factor for current monitor
 Vector2 GetWindowScaleDPI(void)
 {