scanimage: add page (#3543)

pages/linux/scanimage.md

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+# scanimage
+
+> Scan images with the Scanner Access Now Easy API.
+> More information: <http://sane-project.org/man/scanimage.1.html>.
+
+- List available scanners to ensure the target device is connected and recognized:
+
+`scanimage -L`
+
+- Scan an image and save it to a file:
+
+`scanimage --format={{pnm|tiff|png|jpeg}} > {{path/to/new_image}}`