adds candidate recruitment project label field

completes #93

app/views/admin/candidate/_form.html.erb

@@ -16,6 +16,11 @@
     <%= form.select :experience, experience_options(candidate.experience), include_blank: false %>
   </div>
 
+  <div class="form-group">
+    <%= form.label :project, "Client or project" %>
+    <%= form.text_field :project %>
+  </div>
+
   <div class="form-group">
     <%= form.label :quiz_id, "Quiz" %>
     <%= form.select :quiz_id, quiz_options(quizzes, candidate.quiz_id), include_blank: (quizzes.size > 1) %>