pdfinfo: add page (#4329)

pages/common/pdfinfo.md

@@ -0,0 +1,16 @@
+# pdfinfo
+
+> Portable Document Format (PDF) file information viewer.
+> More information: <https://www.xpdfreader.com/pdfinfo-man.html>.
+
+- Print PDF file information:
+
+`pdfinfo {{path/to/file.pdf}}`
+
+- Specify user password for PDF file to bypass security restrictions:
+
+`pdfinfo -upw {{password}} {{path/to/file.pdf}}`
+
+- Specify owner password for PDF file to bypass security restrictions:
+
+`pdfinfo -opw {{password}} {{path/to/file.pdf}}`