Add example

.gitignore

@@ -0,0 +1 @@
+TEST.png

examples/glaggle/main.go

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+package main
+
+import "os"
+import "image"
+import "image/png"
+import "git.tebibyte.media/tomo/ggfx"
+
+func main () {
+	img := image.NewRGBA(image.Rect(0, 0, 800, 600))
+	canvas := ggfx.Image[uint8] {
+		Pix:    img.Pix,
+		Stride: img.Stride,
+		Bounds: img.Rect,
+		Width:  4,
+	}
+	canvas.FillRectangle([]uint8 { 255, 0, 0, 255 }, image.Rect(7, 4, 34, 78))
+	
+	file, err := os.Create("TEST.png")
+	if err != nil { panic(err.Error()) }
+	defer file.Close()
+	err = png.Encode(file, img)
+	if err != nil { panic(err.Error()) }
+	
+	println("Open TEST.png to see the result.")
+}
+