viu: add page (#7295)

pages/common/viu.md

@@ -0,0 +1,24 @@
+# viu
+
+> A small command-line application to view images from the terminal.
+> More information: <https://github.com/atanunq/viu>.
+
+- Render an image or animated GIF:
+
+`viu {{path/to/file}}`
+
+- Render an image or GIF from the internet using `curl`:
+
+`curl -s {{https://example.com/image.png}} | viu -`
+
+- Render an image with a transparent background:
+
+`viu -t {{path/to/file}}`
+
+- Render an image with a specific width and height in pixels:
+
+`viu -w {{width}} -h {{height}} {{path/to/file}}`
+
+- Render an image or GIF and display its file name:
+
+`viu -n {{path/to/file}}`