image package in Go

Package image defines the Image interface:
```
package image

type Image interface {
    ColorModel() color.Model
    Bounds() Rectangle
    At(x, y int) color.Color
}
```
Note: the Rectangle return value of the Bounds method is actually an image.Rectangle, as the declaration is inside package image.
The color.Color and color.Model types are also interfaces, but we'll ignore that by using the predefined implementations color.RGBA and color.RGBAModel. These interfaces and types are specified by the image/color package 
```
package main

import (
	"fmt"
	"image"
)

func main() {
	m := image.NewRGBA(image.Rect(0, 0, 100, 100))
	fmt.Println(m.Bounds())
	fmt.Println(m.At(0, 0).RGBA())
}
```
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