Welcome controller added

Can be used for main index, about page etc.

app/assets/javascripts/welcome.js.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/welcome.css.scss

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

app/controllers/welcome_controller.rb

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+class WelcomeController < ApplicationController
+  def index
+  end
+end

app/helpers/welcome_helper.rb

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+module WelcomeHelper
+end

app/views/welcome/index.html.erb

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+<h1>Hello, Rails!</h1>

test/controllers/welcome_controller_test.rb

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+require 'test_helper'
+
+class WelcomeControllerTest < ActionController::TestCase
+  test "should get index" do
+    get :index
+    assert_response :success
+  end
+
+end