Adding/improving inline documentation

[abhijithch]

It would be great for users to have well written, detailed just enough such that users not too familiar with statistics and the R's glm will be able to use this package with ease. It would be nice have few lines about the function, one liners about the arguments, and examples where applicable. One these lines, I have a sample helper function, for glm(),

I have for now picked from the README, but will be more descriptive. @nalimilan, thanks for your comments on the previous attempt. I plan to redo the documentation and send a new PR.