add a first step to pick center in new event form

Resources/views/Event/newPickCenter.html.twig

@@ -0,0 +1,26 @@
+{% extends 'ChillEventBundle::layout.html.twig' %}
+
+{% block title 'Event creation'|trans %}
+
+{% block event_content -%}
+    <h1>{{ 'Event creation'|trans }}</h1>
+
+    {{ form_start(form) }}
+    {{ form_errors(form) }}
+
+    {{ form_row(form.center_id) }}
+
+    <ul class="record_actions">
+        <li class="cancel">
+            <a href="{{ path('chill_event_list_most_recent') }}" class="sc-button bt-cancel">
+                {{ 'Back to the most recent events'|trans }}
+            </a>
+        </li>
+        <li>
+            {{ form_widget(form.submit, { 'attr' : { 'class' : 'sc-button green' } }) }}
+        </li>
+    </ul>
+            
+    {{ form_end(form) }}
+
+{% endblock %}