asr: add page (#2464)

pages/osx/asr.md

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+# asr
+
+> Restore (copy) a disk image onto a volume.
+> The command name stands for Apple Software Restore.
+
+- Restore a disk image to a target volume:
+
+`sudo asr restore --source {{image_name}}.dmg --target {{path/to/volume}}`
+
+- Erase the target volume before restoring:
+
+`sudo asr restore --source {{image_name}}.dmg --target {{path/to/volume}} --erase`
+
+- Skip verification after restoring:
+
+`sudo asr restore --source {{image_name}}.dmg --target {{path/to/volume}} --noverify`
+
+- Clone volumes without the use of an intermediate disk image:
+
+`sudo asr restore --source {{path/to/volume}} --target {{path/to/cloned_volume}}`