add pages for crux package management utilities

pages/linux/pkginfo.md

@@ -0,0 +1,19 @@
+# pkginfo
+
+> Query the package database on a CRUX system
+
+- list installed packages and their versions
+
+`pkginfo -i`
+
+- list files owned by a package
+
+`pkginfo -l {{package-name}}`
+
+- list the owner(s) of a file matching a pattern
+
+`pkginfo -o {{pattern}}`
+
+- print the footprint of a file
+
+`pkginfo -f {{file}}`