Add announcement admin and view template

app/views/admin/announcements/edit.html.erb

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+<h1>Editing announcement</h1>
+
+<% form_for @announcement, :url => admin_announcement_path(@announcement) do |f| %>
+  <%= f.error_messages %>
+
+  <p>
+    <%= f.label :title, "Title" %>
+    <%= f.text_field :title %>
+  </p>
+  
+  <p>
+    <%= f.label :content, "Content" %>
+    <%= f.text_area :content %>
+  </p>
+  
+  <p>
+    <%= f.submit 'Update' %>
+  </p>
+<% end %>
+
+<%= link_to 'Show', @announcement %> |
+<%= link_to 'Back', admin_announcements_path %>

app/views/admin/announcements/index.html.erb

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+<h1>Listing announcements</h1>
+
+<table>
+  <tr>
+    <th>Title</th>
+    <th>Actions</th>
+  </tr>
+
+<% @announcements.each do |announcement| %>
+  <tr>
+    <td><%=h announcement.title %></td>
+    <td><%= link_to 'Show', announcement_path(announcement) %> |  
+        <%= link_to 'Edit', edit_admin_announcement_path(announcement) %> | 
+        <%= link_to 'Destroy', admin_announcement_path(announcement), :confirm => 'Are you sure?', :method => :delete %></td>
+  </tr>
+<% end %>
+</table>
+
+<br />
+
+<%= link_to 'New announcement', new_admin_announcement_path %>

app/views/admin/announcements/new.html.erb

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+<h1>New announcement</h1>
+
+<% form_for @announcement, :url => admin_announcements_path do |f| %>
+  <%= f.error_messages %>
+
+  <p>
+    <%= f.label :title, "Title" %>
+    <%= f.text_field :title %>
+  </p>
+  
+  <p>
+    <%= f.label :content, "Content" %>
+    <%= f.text_area :content %>
+  </p>
+  
+  <p>
+    <%= f.submit 'Create' %>
+  </p>
+<% end %>
+
+<%= link_to 'Back', admin_announcements_path %>