Add "report" app

- Define ReportTemplate model which contains a report file template

InvenTree/report/admin.py

@@ -0,0 +1,14 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.contrib import admin
+
+from .models import ReportTemplate
+
+
+class ReportTemplateAdmin(admin.ModelAdmin):
+
+    list_display = ('template', 'description')
+
+
+admin.site.register(ReportTemplate, ReportTemplateAdmin)