Updated README

Added a bit more description to README file.
Merge branch 'master' of https://github.com/mattdoe/Hello-World
Updated README.md

Followed GitHub's example "Create a Repo" tutorial, didn't realize that
the README file I created there wouldn't merge with the initial
README.md I created with my repo...so, I pulled in my remote file and am
now updating.
Deleted README file

Deleted unneeded README file since I already have a README.md file that
does all I need.