Update README.md

add access to CodeScene

Author: fmancardi

README.md

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 # TestLink 1.9.20 Raijin - Read me
 
+[![](https://codescene.io/projects/5570/status.svg) Get more details at **codescene.io**.](https://codescene.io/projects/5570/jobs/latest-successful/results)
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 ## Contents
  1. [Introduction](#1-introduction)
  2. [Release notes / Critical Configuration Notes](2-release-notes--critical-configuration-notes)