Go minimal 'Write file' example

This is the minimal example that writes a string (Hello World! in this example) to a file (test.txt in this example) using Go.

package main

import "io/ioutil"

func main() {
    content := "Hello World!"
    ioutil.WriteFile("test.txt", []byte(content), 0644)
}

Note that this example:

• Creates the file with permission mode 0644, i.e. only the owner can write but others can read.
• Encodes the text as UTF-8