add assessement endpoint

app/policies/assessment_policy.rb

@@ -0,0 +1,13 @@
+class AssessmentPolicy < ApplicationPolicy
+  class Scope < Scope
+    def resolve
+      scope.all
+    end
+
+    def index?
+      @roles.find do |role|
+        admin nde coordinator center_director pro_rector teacher
+      end
+    end
+  end
+end