Create inkscape.md

Most of this is based on the excellent "examples" section of Inkscape's man page:
https://inkscape.org/en/doc/inkscape-man.html#examples

pages/common/inkscape.md

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+# inkscape
+
+> An SVG (Scalable Vector Graphics) editing program.
+> Use -z to not open the GUI and only process files in the console.
+
+- Open an SVG file in the Inkscape GUI:
+
+`inkscape {{filename.svg}}`
+
+- Export an SVG file into a bitmap with the default format (PNG) and the default resolution (90 DPI):
+
+`inkscape {{filename.svg}} -e {{filename.png}}`
+
+- Export an SVG file into a bitmap of 600x400 pixels (aspect ratio distortion may occur):
+
+`inkscape {{filename.svg}} -e {{filename.png}} -w {{600}} -h {{400}}`
+
+- Export a single object, given its ID, into a bitmap:
+
+`inkscape {{filename.svg}} -i {{id}} -e {{object.png}}`
+
+- Export an SVG document to PDF, converting all texts to paths:
+
+`inkscape {{filename.svg}} --export-pdf=={{filename.pdf}} --export-text-to-path`
+
+- Duplicate the object with id="path1555", rotate the duplicate 90 degrees, save the SVG, and quit:
+
+`inkscape {{filename.svg}} --select=path1555 --verb=EditDuplicate --verb=ObjectRotate90 --verb=FileSave --verb=FileClose`