xpdf: add page (#4303)

pages/common/xpdf.md

@@ -0,0 +1,28 @@
+# xpdf
+
+> Portable Document Format (PDF) file viewer.
+> More information: <https://www.xpdfreader.com/xpdf-man.html>.
+
+- Open a PDF file:
+
+`xpdf {{path/to/file.pdf}}`
+
+- Open a specific page in a PDF file:
+
+`xpdf {{path/to/file.pdf}} :{{page_number}}`
+
+- Open a compressed PDF file:
+
+`xpdf {{path/to/file.pdf.tar}}`
+
+- Open a PDF file in fullscreen mode:
+
+`xpdf -fullscreen {{path/to/file.pdf}}`
+
+- Specify the initial zoom:
+
+`xpdf -z {{75}}% {{path/to/file.pdf}}`
+
+- Specify the initial zoom at page width or full page:
+
+`xpdf -z {{page|width}} {{path/to/file.pdf}}`