Implement CSV import and conversion to contestants

app/policies/contest_policy.rb

@@ -19,10 +19,18 @@ class ContestPolicy < ApplicationPolicy
     record.user.id == user.id || user.admin?
   end
 
+  def convert_csv?
+    record.user.id == user.id || user.admin?
+  end
+
   def edit?
     record.user.id == user.id || user.admin?
   end
 
+  def finalize_import?
+    record.user.id == user.id || user.admin?
+  end
+
   def update?
     record.user.id == user.id || user.admin?
   end
@@ -38,4 +46,8 @@ class ContestPolicy < ApplicationPolicy
   def scoreboard?
     true
   end
+
+  def upload_csv?
+    record.user.id == user.id || user.admin?
+  end
 end