Document list format and deployment in README

Co-Authored-By: Claude Opus 5.5 <[email protected]>

README.md

@@ -1 +1,33 @@
 # blacklist
+
+Custom blocklists for Pi-hole (v6+).
+
+## Lists
+
+| File | Contents | Raw URL |
+| --- | --- | --- |
+| `blacklist` | Ads, analytics, telemetry, scams, adult, gambling, game ads | `https://git.ki5bhv.com/justin/blacklist/raw/branch/main/blacklist` |
+| `social-only` | Dating sites, social apps, Reddit tracking | `https://git.ki5bhv.com/justin/blacklist/raw/branch/main/social-only` |
+
+## Format
+
+Each entry uses Adblock Plus syntax, which Pi-hole v6 supports:
+
+```
+# Section name
+||example.com^
+```
+
+- `||example.com^` blocks `example.com` **and all its subdomains** (`www.example.com`, `api.example.com`, ...).
+- List the highest domain you want blocked; don't add subdomains that a parent entry already covers.
+- To block only part of a site, list just those subdomains (e.g. `||events.reddit.com^`).
+- Lines starting with `#` are comments; group entries under a `# Section` heading.
+- Domains are lowercase, one per line, no `0.0.0.0` prefix.
+
+## Deploying
+
+After pushing, update gravity on the Pi-hole:
+
+```
+pihole -g
+```