Add recaptcha html

core/user/signup.html

@@ -4,9 +4,14 @@
 
 {% block content %}
   <h2>Sign up</h2>
+  <script src="https://www.google.com/recaptcha/api.js" async defer></script>
+
   <form method="post">
     {% csrf_token %}
     {% bootstrap_form form %}
+    <div class="form-group">
+      <div class="g-recaptcha" data-sitekey="6Ld1AN8UAAAAALCLQJZdnam9MmRaB7Smulf0E5F1"></div>
+    </div>
     <button type="submit">Sign up</button>
   </form>
 {% endblock %}