Software Público Brasileiro

Create elasticsearch structure
Index models for elasticsearch
Adding category search filter
Make query generic
Add README.md for elasticsearch plugin
Start tests with rspec for elasticsearch
Applyng filtering by type on articles
Adding visible filter

Signed-off-by: Lucas Moura <lucas.moura128@gmail.com>
Signed-off-by: Luciano Prestes Cavalcanti <lucianopcbr@gmail.com>
Signed-off-by: Macartur Sousa <macartur.sc@gmail.com>
Signed-off-by: Daniel Henrique <danielhmarinho@gmail.com>