Add the guidance for scheme selection

app/models/form/setup/questions/scheme_id.rb

@@ -7,6 +7,8 @@ class Form::Setup::Questions::SchemeId < ::Form::Question
     @type = "select"
     @answer_options = answer_options
     @derived = true unless FeatureToggle.supported_housing_schemes_enabled?
+    @guidance_position = GuidancePosition::BOTTOM
+    @guidance_partial = "scheme_selection"
   end
 
   def answer_options

app/views/form/guidance/_scheme_selection.html.erb

@@ -0,0 +1,5 @@
+<% if current_user.data_provider? %>
+  <p class="govuk-body">If you can’t find the supported housing service you’re looking for or not sure which to choose, contact a data coordinator at <%= current_user.organisation.name %>.</p>
+<% elsif current_user.data_coordinator? %>
+  <p class="govuk-body">or <%= govuk_link_to "create a new supported housing service", new_scheme_path %></p>
+<% end %>