Add post and species forms

Squashed commit of the following:
Author: Hugo PRADIER <Hugo.PRADIER2@etu.uca.fr>
Author: bastien ollier <bastien.ollier@etu.uca.fr>
Author: clfreville2 <clement.freville2@etu.uca.fr>
Reviewed on #7

templates/post/index.html.twig

@@ -1,11 +0,0 @@
-{% extends 'base.html.twig' %}
-
-{% block title %}Posts!{% endblock %}
-
-{% block body %}
-{% for post in posts %}
-    <div class="card">
-        #{{ post.id }} trouvé le {{ post.foundDate | date("d/m/Y \\à H \\h") }}
-    </div>
-{% endfor %}
-{% endblock %}