[doc] Add Git instruction on README

README.md

@@ -5,9 +5,11 @@ Some user think ergonomy of LimeSurvey 2.50 is not better than 2.06 version. But
 ## Installation ##
 - See [LimeSurvey manual](https://manual.limesurvey.org/Installation)
 - Download and extract <http://extensions.sondages.pro/IMG/auto/limesurvey_sondages-pro.zip>
+- If you have git access `git clone https://framagit.org/Shnoulle/LimeSurvey.git  --branch 2.06_SondagesPro --single-branch limesurvey`
 - [Run_the_installation_script](https://manual.limesurvey.org/Installation#Run_the_installation_script)
 
 
+
 ## Improvement and history ##
 * 1.0.17
     * Merge from core lts