Add Snitcher as an interesting application

[Snitcher](https://snitcher.dannorth.net) makes the lists available as Little Snitch rule groups.

readme.md

@@ -671,6 +671,10 @@ devices under a variety of operating systems.
   offers a public anycast network hosted mirror of the Unified (Adware + Malware) blocklist:
   - Legacy DNS: `76.76.2.35`, `76.76.10.35`, `2606:1a40::35`, `2606:1a40:1::35`
   - DNS-over-HTTPS/TLS/DOQ: `https://freedns.controld.com/x-stevenblack`, `x-stevenblack.freedns.controld.com`
+- [Snitcher](https://snitcher.dannorth.net)
+  Make the blocklists available as [Little Snitch](https://www.obdev.at/products/littlesnitch/index.html) rule groups.
+  - Lists are split in two because Little Snitch has a limit of 200k entries per rule group, and some of the lists are larger than this.
+  - Rule groups are updated weekly, and subscribed Little Snitch instances will auto-update.
 
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