Add controller for Problems with index and show actions

app/views/problems/_problem_pagination.erb

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+<%= will_paginate @problems, renderer: BootstrapPagination::Rails %>

app/views/problems/index.html.erb

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+<h1>Listing Problems</h1>
+
+<%= render 'problem_pagination' %>
+<table class="table table-striped table-bordered">
+  <thead>
+  <tr>
+    <th>ID</th>
+    <th>Title</th>
+  </tr>
+  </thead>
+
+  <tbody>
+  <% @problems.each do |problem| %>
+      <tr>
+        <td><%= problem.id %></td>
+        <td><%= link_to problem.title, problem %></td>
+      </tr>
+  <% end %>
+  </tbody>
+</table>
+<%= render 'problem_pagination' %>
+<br>

app/views/problems/show.html.erb

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+<% if notice %>
+    <p id="notice"><%= notice %></p>
+<% end %>
+
+<div class="page-header">
+  <h1><%= @problem.title %> <small>Problem <%= @problem.id %></small></h1>
+</div>
+
+<%= panel do %>
+    <div class="panel-body problem-content">
+      <%= sanitize @problem.content %>
+    </div>
+<% end %>
+<div class="text-center">
+  <%= link_to 'Dieses Problem auf projecteuler.net', @problem.translation.original_url, target: '_blank' %>
+</div>