Add ReportAsset model

- Files which can be embedded into a report

InvenTree/report/admin.py

@@ -3,7 +3,7 @@ from __future__ import unicode_literals
 
 from django.contrib import admin
 
-from .models import ReportTemplate
+from .models import ReportTemplate, ReportAsset
 
 
 class ReportTemplateAdmin(admin.ModelAdmin):
@@ -11,4 +11,10 @@ class ReportTemplateAdmin(admin.ModelAdmin):
     list_display = ('template', 'description')
 
 
+class ReportAssetAdmin(admin.ModelAdmin):
+
+    list_display = ('asset', 'description')
+
+
 admin.site.register(ReportTemplate, ReportTemplateAdmin)
+admin.site.register(ReportAsset, ReportAssetAdmin)