Added a new example that incredibly speeds up the scraping process utilizing threading

[ebhechmer]

I used threading within my own implementations, so I figured I would add in an example similar to what I've done.

[cullenwatson]

the offset in Indeed just skips x pages but actually visits the pages. I'd recommend no offset and just change your search. No delay is needed as well. For a 500 results all you need is one thread. For 50,000 results, yes you should use threads.