Add autorefresh_list experiment

This experiment/feature checks at regular intervals whether there are
updates to thread lists, and notifies the user via a snackbar when
an update exists.

Bug: #42
Change-Id: I98e4aa03a7080c6bff781ce7c850477433090957
diff --git a/templates/manifest.gjson b/templates/manifest.gjson
index 83edfd8..266ec60 100644
--- a/templates/manifest.gjson
+++ b/templates/manifest.gjson
@@ -73,7 +73,8 @@
         "injections/batchlock_inject.js",
         "injections/enhanced_announcements_dot.css",
         "injections/reposition_expand_thread.css",
-        "injections/thread_list_avatars.css"
+        "injections/thread_list_avatars.css",
+        "injections/autorefresh_list.css"
 #if defined(CHROMIUM_MV3)
       ],
       "matches": [