Add field list expected in the CSV file for asset import

Closes #8507

UI/asset/import_asset.html

@@ -21,6 +21,39 @@
        class = "file"
 } %]
 </div>
+The following fields are expected (in this order):
+<dl>
+  <dt>tag</dt>
+  <dd />
+  <dt>purchase_date</dt>
+  <dd />
+  <dt>description</dt>
+  <dd />
+  <dt>asset_class</dt>
+  <dd />
+  <dt>location</dt>
+  <dd />
+  <dt>vendor</dt>
+  <dd />
+  <dt>invoice</dt>
+  <dd />
+  <dt>department</dt>
+  <dd />
+  <dt>asset_account</dt>
+  <dd />
+  <dt>purchase_value</dt>
+  <dd />
+  <dt>accum_dep</dt>
+  <dd />
+  <dt>nbv</dt>
+  <dd />
+  <dt>start_depreciation</dt>
+  <dd />
+  <dt>usable_life</dt>
+  <dd />
+  <dt>usable_life_remaining</dt>
+  <dd />
+</dl>
 <div class="inputrow" id="buttonrow">
 [% PROCESS button element_data = {
         text = text("Save")