12.1. If: Added example of single statement if block

[karimdevelops]

For better readability, I have added example that you do need curly braces always by showing single statement if block.

void main() {
int age = 20;
if (age < 25)
    IO.println("You are too young to rent a car!"); // If condition evaluates to true
IO.println("Bye bye"); // Always printed
}

[bowbahdoe]

@karimdevelops hey man, I am going to review these, but it will be more productive to make issues for most things, rather than PRs.

Like with this I am very intentionally not mentioning the short form of if. I can go back and address shorthands later but there isn't too much value to doing so

[karimdevelops]

@bowbahdoe Sure, i was reading your contribution guidelines too and you mentioned issues there.
I will keep that in mind.

[bowbahdoe]

@karimdevelops Other people wrote that - as you can see from the 67 issues and open prs I do have a lot to do. I'll get to it