Added PNG

I've added Papa New Guineau, one of the most culturally diverse countries in the world. 848 languages are listed for the country, of which 12 have no known living speakers. Most of the population of over 7 million people live in customary communities, which are as diverse as the languages. It is also one of the most rural, as only 18 per cent of its people live in urban centres.  The country is one of the world's least explored, culturally and geographically, and many undiscovered species of plants and animals are thought to exist in the interior.