create api for adding a render entity function

Templating/Entity/ChillEntityRenderInterface.php

@@ -0,0 +1,66 @@
+<?php
+/*
+ * Chill is a software for social workers
+ *
+ * Copyright (C) 2014-2019, Champs Libres Cooperative SCRLFS, 
+ * <http://www.champs-libres.coop>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+namespace Chill\MainBundle\Templating\Entity;
+
+/**
+ * Interface to implement which will render an entity in template on a custom
+ * manner.
+ */
+interface ChillEntityRenderInterface
+{
+    /**
+     * Return true if the class support this object for the given options
+     * 
+     * @param type $entity
+     * @param array $options
+     * @return bool
+     */
+    public function supports($entity, array $options): bool;
+    
+    /**
+     * Return the entity as a string.
+     * 
+     * Example: returning the name of a person.
+     * 
+     * @param object $entity
+     * @param array $options
+     * @return string
+     */
+    public function renderString($entity, array $options): string;
+    
+    /**
+     * Return the entity in a box
+     * 
+     * Example: return a person inside a box:
+     * 
+     * ```html
+     * <span class="chill-entity">
+     *  <span class="chill-entity__first-name">Roger</span>
+     *  <span class="chill-entity__last-name">Dupont</span>
+     * </span>
+     * ```
+     * 
+     * @param type $entity
+     * @param array $options
+     * @return string
+     */
+    public function renderBox($entity, array $options): string;
+}