Added text to the register screen

Prewar users they’ll need access to their email account and mobile
phone when registering.

app/templates/register.html

@@ -12,6 +12,8 @@ Hello world!
 
 		<p>If you've used GOV.UK Notify before, <a href="">sign in to your account</a>.</p>
 
+    <p>You need to have access to your email account and a mobile phone to register.</p>
+
 		<p>
 		<label class="form-label" for="name-f1">Name</label>
   		<input class="form-control-2-3" id="name-f1" type="text">