Add likes model, controller and tests

app/controllers/likes_controller.rb

@@ -0,0 +1,33 @@
+class LikesController < ApplicationController
+  before_action :authenticate_user!
+
+  def create
+    like = Like.new(like_params)
+
+    if like.save
+      render json: like, status: :created
+    else
+      render json: {
+        error: I18n.t('errors.likes.create', message: like.errors.full_messages)
+      }, status: :unprocessable_entity
+    end
+  end
+
+  def destroy
+    like = Like.where(like_params)
+
+    if like.destroy
+      render json: {}, status: :no_content
+    else
+      render json: {
+        error: I18n.t('errors.likes.destroy', message: like.errors.full_messages)
+      }, status: :unprocessable_entity
+    end
+  end
+
+  private
+
+    def like_params
+      params.permit(:post_id).merge(user_id: current_user.id)
+    end
+end