add mock recommender service for development, add user-context recommended posts

app/controllers/recommended_posts_controller.rb

@@ -0,0 +1,23 @@
+class RecommendedPostsController < ApplicationController
+  before_action :member_only
+  respond_to :html
+
+  def show
+    @posts = load_posts()
+
+    if request.xhr?
+      render partial: "show", layout: false
+    end
+  end
+
+private
+
+  def load_posts
+    if params[:context] == "post"
+      @posts = RecommenderService.recommend(post_id: params[:post_id])
+
+    elsif params[:context] == "user"
+      @posts = RecommenderService.recommend(user_id: CurrentUser.id)
+    end
+  end
+end