photorec, ddrescue: add page (#3625)

pages/linux/ddrescue.md

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+# ddrescue
+
+> Data recovery tool that reads data from damaged block devices.
+> More information: <https://www.gnu.org/software/ddrescue/>.
+
+- Take an image of a device, creating a log file:
+
+`sudo ddrescue {{/dev/sdb}} {{path/to/image.dd}} {{path/to/log.txt}}`
+
+- Clone Disk A to Disk B, creating a log file:
+
+`sudo ddrescue --force --no-scrape {{/dev/sda}} {{/dev/sdb}} {{path/to/log.txt}}`