feat: add the new reminders app

src/reminders/admin.py

@@ -0,0 +1,20 @@
+from django.conf import settings
+from django.contrib import admin
+
+from .models import Reminder
+
+
+class ReminderAdmin(admin.ModelAdmin):
+
+    class Media:
+        css = {
+            "all": ("paperless.css",)
+        }
+
+    list_per_page = settings.PAPERLESS_LIST_PER_PAGE
+    list_display = ("date", "document", "note")
+    list_filter = ("date",)
+    list_editable = ("note",)
+
+
+admin.site.register(Reminder, ReminderAdmin)