[Student-projects] Varnam accepts sentence

[malayalee coder]

I was doing this issue,
https://github.com/varnamproject/libvarnam/issues/133 , to get well
familiar with the codebase. Currently I have submitted a PR,
https://github.com/varnamproject/libvarnam/pull/135 , for the
transliteration and once this gets accepted I would submit a similar
patch for reverse transliteration also.

Please have a look at the patch and suggest improvements :)