import: add page (#1255)

pages/common/import.md

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+# import
+
+> Capture some or all of an X server screen and save the image to a file.
+> Part of ImageMagick library.
+
+- Capture the entire X server screen in the Postscript image format:
+
+`import -window root {{output.postscript}}`
+
+- Capture contents of remote x server screen in the `png` image format:
+
+`import -window root -display {{remote_host}}:{screen}.{display} {{output.png}}`
+
+- Capture specific window with ID as displayed by `xwininfo` into `jpg` format:
+
+`import -window {{window_id}} {{output.jpg}}`