Add badges to README

README.md

@@ -4,6 +4,16 @@ Artefact is a framework to generate PDF documents in Pharo.
 
 Artefact is written and supported by Olivier Auverlot and Guillaume Larcheveque (aka The Pasta Team) 
 
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 ## Description
 
 It is fully written in Smalltalk and doesn't require any native library. Artefact is light, platform independant and offer to users a high level of abstraction in order to easily creating PDF documents.