Add exercise feedback page for pair programming study

app/models/pair_programming_exercise_feedback.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+class PairProgrammingExerciseFeedback < ApplicationRecord
+  include Creation
+
+  belongs_to :exercise
+  belongs_to :submission
+  belongs_to :study_group
+  belongs_to :programming_group, optional: true
+  has_one :execution_environment, through: :exercise
+
+  scope :intermediate, -> { where.not(normalized_score: 1.00) }
+  scope :final, -> { where(normalized_score: 1.00) }
+
+  def to_s
+    'Pair Programming Exercise Feedback'
+  end
+end