Add config example to readme

README.md

@@ -2,3 +2,35 @@
 
 Delete dated files in a directory according to a time period config.
 Useful for backup directories that accumulate files over time.
+
+## Example config
+```toml
+# Specify a folder containing backups
+path = "/backups/docker"
+
+# uncomment if the backups are btrfs subvolumes
+#btrfs = true
+
+[[periods]]
+# For the first day, keep one backup per second (basically, don't delete backups)
+# syntax supports suffixes s, m, h, d, w
+period_length = "1d"
+chunk_size = "1s"
+
+[[periods]]
+# For the next week, keep one backup per hour
+period_length = "1w"
+chunk_size = "1h"
+
+[[periods]]
+# For the next 4 weeks, keep one backup per day
+period_length = "4w"
+chunk_size = "1d"
+
+# can add more [[periods]] as needed
+```
+
+## Example usage
+```sh
+filereap --help
+```