Ajd chapter3

Chapter 3 done.
This actually has the following output:
```
0 1
2 3 
4 5
6 7 
8 9
```
This is because the continue will cause it to skip printing a new line if i is a multiple of 2 (this includes 0). So it goes 0%2 = 0 -> continue, 1%2 = 1 -> print new line, 2%2 = 0 -> continue, etc...