Add asset model and controller

app/views/admin/assets/_form.html.erb

@@ -0,0 +1,16 @@
+<%= f.error_messages %>
+
+<p>
+<%= f.label :filename, "FileName" %>
+<%= f.text_field :filename, :class => 'text' %>
+</p>
+
+<p>
+<%= f.label :description, "Description" %>
+<%= f.text_field :description, :class => 'text' %>
+</p>
+
+<p>
+<%= f.label :data, "Data" %>
+<%= f.file_field :data %>
+</p>

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

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+<h1>Editing assets</h1>
+
+<% form_for @asset, :url => admin_asset_path(@asset), :html => { :multipart => true } do |f| %>
+  <%= f.error_messages %>
+  
+  <%= render :partial => "form", :locals => { :f => f } %>
+  <p>
+    <%= f.submit 'Update' %>
+  </p>
+<% end %>
+
+<%= link_to 'Back', admin_assets_path %>

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

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+<h1>Listing assets</h1>
+
+<table>
+  <tr>
+      <th>檔案</th>
+      <th>描述</th>
+      <th>格式</th>
+      <th>原上傳檔名</th>
+      <th>檔案大小</th>
+      <th></th>
+      <th></th>
+  </tr>
+
+<% @assets.each do |asset| %>
+  <tr>
+    <td><%= link_to asset.filename, admin_asset_path(asset) %></td>
+    <td><%= asset.description %></td>
+    <td><%= asset.data.content_type %></td>
+    <td><%= asset.data.file_name %></td>
+    <td><%= number_to_human_size(asset.data.file_size) %></td>
+    <td><%= link_to t(:edit), edit_admin_asset_path(asset) %></td>
+    <td><%= link_to t(:delete), admin_asset_path(asset), :confirm => 'Are you sure?', :method => :delete %></td>
+  </tr>
+<% end %>
+</table>
+
+<br />
+
+<%= link_to t(:new_asset, :scope => :admin), new_admin_asset_path, :class => 'button positive' %>

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

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+<h1>New Asset</h1>
+
+<% form_for :asset, :url => admin_assets_path, :html => { :multipart => true } do |f| %>
+  <%= f.error_messages %>
+
+  <%= render :partial => "form", :locals => { :f => f } %>
+  
+  <p>
+    <%= f.submit 'Create' %>
+  </p>
+<% end %>