port: add page (#1499)

pages/osx/port.md

@@ -0,0 +1,27 @@
+# port
+
+> Package manager for macOS.
+
+- Search for a package:
+
+`port search {{search_term}}`
+
+- Install a package:
+
+`sudo port install {{package_name}}`
+
+- List installed packages:
+
+`port installed`
+
+- Update port and fetch latest list of available packages:
+
+`sudo port selfupdate`
+
+- Upgrade outdated packages:
+
+`sudo port upgrade outdated`
+
+- Remove old versions of installed packages:
+
+`sudo port uninstall inactive`