adding remove event feature

Resources/views/Participation/confirm_delete.html.twig

@@ -0,0 +1,20 @@
+{% extends 'ChillEventBundle::layout.html.twig' %}
+
+{% set activeRouteKey = 'chill_event__event_show' %}
+
+{% block title 'Remove participation'|trans %}
+
+{% block event_content %}
+
+    {{ include('ChillMainBundle:Util:confirmation_template.html.twig',
+        {
+            'title'             : 'Remove participation'|trans,
+            'confirm_question'  : 'Are you sure you want to remove that participation ?'|trans,
+            'cancel_route'      : activeRouteKey,
+            'cancel_parameters' : { 'event_id' : event_id },
+            'form'              : delete_form
+        }
+    ) }}
+
+{% endblock %}
+