viewnior: add page

pages/linux/viewnior.md

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+# viewnior
+
+> Simple and elegant image viewer.
+
+- View an image:
+
+`viewnior {{path/to/image.png}}`
+
+- View in fullscreen mode:
+
+`viewnior --fullscreen {{path/to/image.png}}`
+
+- View fullscreen in slideshow mode:
+
+`viewnior --slideshow {{path/to/image.png}}`