[Vala] request to add another example to Projects/Vala/ListExample

[MohanR <mohan43u gmail com>]

Hi,

I'm a beginner in vala. I would like to add the following example to
this wiki link to make other beginners understand important thing about
List<string>.

https://wiki.gnome.org/Projects/Vala/ListSample

int main(string[] args) {
    List<string> mylist = new List<string>();
    mylist.append("hi");
    mylist.append("how");
    mylist.append("are");
    mylist.append("you");

    /* prints length: 4 */
    stdout.printf("length: %u\n", mylist.length());

    /* following wont work as expected because in
     * C universe, "how" and "how" is not equal
     */
    mylist.remove("how");

    /* still prints length: 4 */
    stdout.printf("length: %u\n", mylist.length());

    /* works because "how" and "how" is equal
     * according to strcmp()
     */
    mylist.remove_link(mylist.find_custom("how", strcmp));

    /* prints length: 3 */
    stdout.printf("length: %u\n", mylist.length());

    return 0;
}