contactsd: add page (#18498)

Author: dukecat0

pages/osx/contactsd.md

@@ -0,0 +1,10 @@
+# contactsd
+
+> Manages the information in your contacts database.
+> It provides functionality to apps using the Contacts API and performs various background maintenance tasks.
+> It should not be invoked manually.
+> More information: <https://keith.github.io/xcode-man-pages/contactsd.8.html>.
+
+- Start the daemon:
+
+`contactsd`