Re: New "Learn Nim" page

[rect0x51]

@Prohyon it's actually the other way around. When you use a `for` loop with 1 
iterator (e.g. `for i in 0 .. 9:`) you are iterating over **values**. If you 
want to also have the corresponding index of each loop you have to do ` for i, 
v in 0 .. 9:`, then `i` will be the index and `v` the value. Also keep in mind 
that `mod` is an expensive function, you should try to avoid it if possible.