Move translations to translation directory

Currently the project page at github lists all translations as they're
in root directory. Moving them to a directory named translation will
make it better to look at.

Also removed link to English translation from main Readme

README.md

@@ -8,7 +8,7 @@ Reading articles & watching tutorials can help, but what comes better than actua
 
 <img align="right" width="300" src="assets/fork.png" alt="fork this repository" />
 
-*Read this in other languages: [English](README.md), [Spanish](README.es.md), [Dutch](README.nl.md), [Hindi](README.hi.md), [Russian](README.ru.md), [Japanese](README.ja.md), [Vietnamese](README.vn.md), [Polish](README.pl.md), [Korean](README.ko.md), [German](README.de.md), [Simplified Chinese](README.chs.md), [Traditional Chinese](README.cht.md), [Greek](README.gr.md).*
+*Read this in other languages: [Spanish](translations/README.es.md), [Dutch](translations/README.nl.md), [Hindi](translations/README.hi.md), [Russian](translations/README.ru.md), [Japanese](translations/README.ja.md), [Vietnamese](translations/README.vn.md), [Polish](translations/README.pl.md), [Korean](translations/README.ko.md), [German](translations/README.de.md), [Simplified Chinese](translations/README.chs.md), [Traditional Chinese](translations/README.cht.md), [Greek](translations/README.gr.md).*
 
 If you don't have git on your machine, [ install it ]( https://help.github.com/articles/set-up-git/ )