created markdown through Rstudio
Revised

Signed-off-by: krohrer <krohrer@doe.nv.gov>
New md document created
add newhelloworld.md
add helloworld2.md for test
modified newhelloworld.md
Merge branch 'master' of https://github.com/klrohrer/Data-Science-Coursera
add files and edits to HelloWorld.md