gphoto2: add page (#21992)

pages/linux/gphoto2.md

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+# gphoto2
+
+> Control digital cameras from the command line.
+> More information: <http://www.gphoto.org/doc/manual/ref-gphoto2-cli.html>.
+
+- List connected cameras:
+
+`gphoto2 --auto-detect`
+
+- List files on the camera:
+
+`gphoto2 {{[-L|--list-files]}}`
+
+- Download all images:
+
+`gphoto2 {{[-P|--get-all-files]}}`
+
+- Download only new images (skip existing):
+
+`gphoto2 {{[-P|--get-all-files]}} --new`
+
+- Download files 1 through 5:
+
+`gphoto2 {{[-p|--get-file]}} 1-5`
+
+- Delete all files on the camera:
+
+`gphoto2 {{[-D|--delete-all-files]}}`
+
+- Capture an image and download it:
+
+`gphoto2 --capture-image-and-download`
+
+- Show camera information:
+
+`gphoto2 --summary`