installation steps added

Author: gaerfield

README.md

@@ -32,12 +32,24 @@ make install
 As suggested by [Brian Koopman][bkoop] this target uses [systemd-timers][dtim]
 instead of cron.
 
-```
-wget https://github.com/gaerfield/zfs-auto-snapshot/archive/master.zip
-unzip master.zip
-cd zfs-auto-snapshot-master
-make systemd
-```
+1) install the scripts:
+    ```
+    wget https://github.com/gaerfield/zfs-auto-snapshot/archive/master.zip
+    unzip master.zip
+    cd zfs-auto-snapshot-master
+    make systemd
+    ```
+2) optionally edit `zfs-auto-snapshot-frequent.timer` to snapshot more often and `zfs-auto-snapshot-frequent.service` to keep more snapshots
+3) enable zfs snapshots: `zfs set com.sun:auto-snapshot=true pool/dataset`
+4) enable timers:
+    ```
+    systemctl enable zfs-auto-snapshot-daily.timer
+    systemctl enable zfs-auto-snapshot-frequent.timer
+    systemctl enable zfs-auto-snapshot-hourly.timer
+    systemctl enable zfs-auto-snapshot-daily.timer
+    systemctl enable zfs-auto-snapshot-weekly.timer
+    systemctl enable zfs-auto-snapshot-monthly.timer
+    ```
 
 [bkoop]: https://briankoopman.com/zfs-automated-snapshots/
 [dtim]: https://wiki.archlinux.org/index.php/Systemd/Timers