snapper: add page

pages/linux/snapper.md

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+# snapper
+
+> Filesystem snapshot management tool
+
+- List snapshot configs:
+
+`snapper list-configs`
+
+- Create snapper config:
+
+`snapper -c {{config}} create-config {{path/to/subvolume}}`
+
+- List snapshots for a config:
+
+`snapper -c {{config}} list`
+
+- Create a new snapshot:
+
+`snapper -c {{config}} snapshot`
+
+- Delete a snapshot:
+
+`snapper -c {{config}} delete {{snapshot_number}}`
+
+- Delete multiple snapshots:
+
+`snapper -c {{config}} delete {{snapshot_1}}-{{snapshot_2}}`