Add words controller with index and show actions

app/views/words/index.html.erb

@@ -0,0 +1,3 @@
+<% @words.each do |word| %>
+  <p><%= link_to word.word, word %></p>
+<% end %>

app/views/words/show.html.erb

@@ -0,0 +1,3 @@
+<h1><%= @word.word %></h1>
+
+<%= render "application/definitions", word: @word %>