Update README.md

Fixed various gramatical errors, and rephrased much of the language.
Removed outline on search input field
Creado el fichero Léeme.md (es-ES)
Merge pull request #50 from javivi/master

Creado el fichero Léeme.md (es-ES)
Merge pull request #17 from amingilani/edit-readme

Update README.md - calling all contributers
Merge pull request #24 from moomoohk/patch-1

Removed outline on search input field
Merge pull request #1 from isohuntto/master

Update from master