Add custom domain monitoring and update documentation

list.example.txt

@@ -0,0 +1,13 @@
+# Add domains to monitor here (one per line)
+# Supports simple wildcard matches if implemented
+# These are NOT block rules, just alert rules!!!!!
+
+# Example custom domains to monitor
+# Use '!' at the start of a line to exclude a domain (negative filter)
+example.com
+*.doubleclick.net
+ads.google.com
+
+# Negative Filters (exclude these domains from monitoring)
+!discord.com
+!*.discord.com