darling: add page (#14980)

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

pages/linux/darling.md

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+# darling
+
+> Run macOS software on Linux.
+> More information: <https://darlinghq.org>.
+
+- Run a builtin command:
+
+`darling shell {{uname}}`
+
+- Run a specific program in the current path with arguments:
+
+`darling shell {{./program}} {{program_argument_1 program_argument_2 ...}}`
+
+- Open a macOS shell:
+
+`darling shell`
+
+- Shutdown the service:
+
+`darling shutdown`