add get-window-position to allow access to GetWindowPosition()

api.txt

@@ -16,6 +16,7 @@
 [x] void SetWindowMonitor(int monitor)
 [x] void SetWindowMinSize(int width, int height)
 [x] void SetWindowSize(int width, int height)
+[x] Vector2 GetWindowPosition()
 [x] void *GetWindowHandle(void)
 [x] int GetScreenWidth(void)
 [x] int GetScreenHeight(void)

src/core.h

@@ -246,6 +246,13 @@ static Janet cfun_GetMonitorPhysicalHeight(int32_t argc, Janet *argv) {
     return janet_wrap_integer(GetMonitorPhysicalHeight(monitor));
 }
 
+static Janet cfun_GetWindowPosition(int32_t argc, Janet *argv) {
+    (void) argv;
+    janet_fixarity(argc, 0);
+    Vector2 position = GetWindowPosition();
+    return jaylib_wrap_vec2(position);
+}
+
 static Janet cfun_GetWindowScaleDPI(int32_t argc, Janet *argv) {
     (void) argv;
     janet_fixarity(argc, 0);
@@ -1023,6 +1030,10 @@ static JanetReg core_cfuns[] = {
     {"get-monitor-physical-height", cfun_GetMonitorPhysicalHeight, 
         "(get-monitor-physical-height monitor)\n\n" 
         "Get specified monitor physical height in millimetres"
+	},
+    {"get-window-position", cfun_GetWindowPosition,
+        "(get-window-position)\n\n"
+        "Get the window position on screen"
     },
     {"get-window-scale-dpi", cfun_GetWindowScaleDPI,
         "(get-window-scale-dpi)\n\n"