File Word Count
Write a program that takes a filename and a parameter n and prints the n most common words in the file, and the count of their occurrences, in descending order.
For example:
	word_stats("article.txt", 5)
	"the", 39
	"device", 21
	"start", 14
	"pidgeon", 9
	"box", 3
Import the included article.txt file and use that to test your program. What are the top 10 words and their frequency?