Scaffold exercise collection routes

app/controllers/exercise_collections_controller.rb

@@ -0,0 +1,24 @@
+class ExerciseCollectionsController < ApplicationController
+
+  before_action :set_exercise_collection, only: [:show]
+
+  def index
+    @exercise_collections = ExerciseCollection.all
+    authorize!
+  end
+
+  def show
+  end
+
+
+  private
+
+  def set_exercise_collection
+    @exercise_collection = ExerciseCollection.find(params[:id])
+    authorize!
+  end
+
+  def authorize!
+    authorize(@exercise_collection || @exercise_collections)
+  end
+end