Add ref to set up HTTPS

Guides/jenkins.md

@@ -19,6 +19,12 @@ sudo apt-get install jenkins ;
 
 Jenkins is now installed as a daemon and you should connect locally to it with a browser to complete installation.
 
+### HTTPS
+
+The best way to secure _Jenkins_ is to use the proxy with _Apache_.
+
+[Jenkins wiki : running Jenkins behind Apache](https://wiki.jenkins.io/display/JENKINS/Running+Jenkins+behind+Apache)
+
 ## Trouble shooting
 
 ### Logs