update snapraid readme

roles/snapraid/README.md

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+snapraid
+========
+
+Installs and configures snapraid. Installs periodic S.M.A.R.T. tests on all disks as well as automated snapraid syncs.
+
+Variables
+---------
+
+    snapraid_parity_disks:
+      - path: /mnt/parity1
+        parity: parity
+ 
+      - path: /mnt/parity2
+        parity: 2-parity
+
+
+    snapraid_data_disks:
+      - path: /mnt/disk1
+
+
+Cronjobs can have any of the following settings:
+
+* minute
+* hour
+* dom
+* month
+* dow
+
+
+Default cronjob times:
+
+    snapraid_sync_cron:
+      minute: '30'
+      hour: '3'
+
+    snapraid_smart_test_cron:
+      minute: '0'
+      hour: '0' 
+      dow: '0'