plutil: add page (#4343)

pages/osx/plutil.md

@@ -0,0 +1,23 @@
+# plutil
+
+> View, convert, validate, or edit property list ("plist") files.
+
+- Display the contents of one or more plist files in human-readable format:
+
+`plutil -p {{file1.plist file2.plist ...}}`
+
+- Convert one or more plist files to XML format, overwriting the original files in-place:
+
+`plutil -convert xml1 {{file1.plist file2.plist ...}}`
+
+- Convert one or more plist files to binary format, overwriting the original files in-place:
+
+`plutil -convert binary1 {{file1.plist file2.plist ...}}`
+
+- Convert a plist file to a different format, writing to a new file:
+
+`plutil -convert {{xml1|binary1|json|swift|objc}} {{path/to/file.plist}} -o {{path/to/new_file.plist}}`
+
+- Convert a plist file to a different format, writing to `stdout`:
+
+`plutil -convert {{xml1|binary1|json|swift|objc}} {{path/to/file.plist}} -o -`