implement anti-csrf measures in all posted forms

capsulflask/templates/create-capsul.html

@@ -37,6 +37,7 @@
   {% else %}
 
     <form method="post">
+      <input type="hidden" name="csrf-token" value="{{ csrf_token }}"/>
       <div class="row justify-start">
         <label class="align"  for="size">Capsul Size</label>
         <select id="size" name="size">