add a gitlab-ci example for a PHP 7.0 project

examples/PHP.md

@@ -2,7 +2,11 @@
 
 ## Standard PHP app with lint and SonarQube analysis
 
-```
+- One 'test' stage with two jobs.
+- The jobs needs a runner with docker-host capabilities. 
+- The job SonarQube is executed only in the branch `develop`.
+
+``` yml
 # To use this script, you must have the following variables defined
 # You can define them at the project or the group level
 #