create microposts controller

app/assets/javascripts/microposts.coffee

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+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://coffeescript.org/

app/assets/stylesheets/microposts.scss

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+// Place all the styles related to the Microposts controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/

app/controllers/microposts_controller.rb

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+class MicropostsController < ApplicationController
+end

app/helpers/microposts_helper.rb

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+module MicropostsHelper
+end

test/controllers/microposts_controller_test.rb

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+require 'test_helper'
+
+class MicropostsControllerTest < ActionController::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end