Add CLI flags

README.md

@@ -5,5 +5,15 @@ Download images from reddit.
 ```bash
 go mod tidy
 
-go run main.go
+go run main.go pics oldschoolcool thewaywewere MilitaryPorn EarthPorn
+```
+
+```bash
+docker run --restart unless-stopped \
+  -v ${PWD}/subreddits:/data/subreddits \
+  ghcr.io/cwpearson/reimager --every 1800 --out-dir /data/subreddits \
+    pics \
+    EarthPorn \
+    oldschoolcool \
+    thewaywewere
 ```