Update installation.md to add the utilisation of service in SSO configuration

EVS-Client/installation.md

@@ -77,7 +77,26 @@ touch /usr/local/jboss7/standalone/deployments/EVSClient.ear
 
 
 ## Configuration
+### SSO
+This application read the configuration of the SSO in a file located in `/opt/gazelle/cas`. We need to create this folder and the configuration file `EVSClient.properties`.
 
+```
+ mkdir /opt/gazelle/cas
+ touch /opt/gazelle/cas/EVSClient.properties
+ chown -R jboss:jboss-admin /opt/gazelle/cas
+ chmod -R g+w /opt/gazelle/cas
+```
+
+Here is a sample of the content of the property file. Please replace __stretch.localdomain__ with the __FQDN__ of your server.
+
+```
+casServerUrlPrefix=https://stretch.localdomain/sso
+casServerLoginUrl=https://stretch.localdomain/sso/login
+casLogoutUrl=https://stretch.localdomain/sso/logout
+service=https://stretch.localdomain/EVSClient
+```
+
+### Database
 The application database is : evs-client-prod.
 
 The application uses the database to store: