added hello-world problem

hello-world.md

@@ -0,0 +1,15 @@
+# Hello, World!
+
+["Hello, World!"](http://en.wikipedia.org/wiki/%22Hello,_world!%22_program) is typically the first 
+program that anyone writes in any language. It is, by design, an example of the absolute simplest 
+program that can possibly be written in any given language. Whenever an experienced programmer 
+starts to learn a new programming language, it is very common that the first program they will 
+write is some form of "Hello, World!" This helps them do two things:
+
+1. Verify that their developement environment is working properly
+2. Prove to themselves that they can write a very simple program
+
+Basically, a "Hello, World!" program simply outputs the text "Hello, World!" to the screen 
+or console. (NOTE: if you don't know what a console aka command-line interface aka command 
+window aka terminal window is, you should take a few minutes to 
+[read the Wikipedia article about the Command-line interface](http://en.wikipedia.org/wiki/Command-line_interface).)

hello-world.yml

@@ -0,0 +1,4 @@
+---
+blurb: '"Hello, World!" is the simplest program that can be written in any language.'
+source: "This is a program with a long and glorious tradition."
+source_url: "http://en.wikipedia.org/wiki/%22Hello,_world!%22_program"