add show post (def show in controller, view show.html.erb, get in routes.rb
added all posts table (method in PostsController, view in app/views/posts/index.html.erb, get 'posts' => 'posts#index' (controller#method) in routes.rb
added views posts/index and show
added controllers posts and welcome
added ALL files
added some links between Listing posts, new post and show post pages
added description in README.md
CRUD complete
getting up and running section completed