:octocat: Added .gitattributes & .gitignore files
Added HelloWorld.md file

Assignment 3 changes - Added HelloWorld file
Revert "Added HelloWorld.md file"

This reverts commit a408582d075d25d6f4e5876335a27c95e843558a.
Added for assignment 3
Merge branch 'master' of https://github.com/BaalaCourses/datasciencecoursera