add scale example

examples/scale/main.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/go-vgo/robotgo"
+)
+
+func main() {
+	width, height := robotgo.GetScaleSize()
+	fmt.Println("GetScreenSize: ", width, height)
+
+	bitmap := robotgo.CaptureScreen(0, 0, width, height)
+	robotgo.SaveBitmap(bitmap, "test.png")
+
+	s := robotgo.Scale()
+	robotx := 35 * s / 100
+	roboty := 25 * s / 100
+	bit1 := robotgo.CaptureScreen(0, 0, robotx, roboty)
+	robotgo.SaveBitmap(bit1, "test2.png")
+
+	clo := robotgo.GetPixelColor(robotx, roboty)
+	fmt.Println("GetPixelColor...", clo)
+}