Create port.md

Proposed page for mac ports port cli.

pages/osx/port.md

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+# port
+
+> macOS package manager
+
+- Search for package:
+
+`port search {{search_term}}`
+
+- Install package:
+
+`sudo port install {{package_name}}`
+
+- List installed packages:
+
+`port installed`
+
+- Update ports tree:
+
+`sudo port selfupdate`
+
+- Upgrade outdated packages:
+
+`sudo port upgrade outdated`
+
+- Remove inactive port versions:
+
+`sudo port uninstall inactive`