added error handling

app/templates/ratelimit_error.html

@@ -0,0 +1,14 @@
+{% extends "base.html" %}
+{% block content %}
+<style>
+ .container {
+    text-align: center;
+  }
+</style>
+
+<div class="container">
+  <h1>> Ratelimit exceeded:</h1>
+  <h1 style="color:#ffffff;">{{ error_message }}</h1>
+</div>
+
+{% endblock %}