Adding a plugin with aliases for macports

plugins/macports.plugin.zsh

@@ -0,0 +1,6 @@
+alias pc="sudo port clean --all installed"
+alias pi="sudo port install $1"
+alias psu="sudo port selfupdate"
+alias puni="sudo port uninstall inactive"
+alias puo="sudo port upgrade outdated"
+alias pup="psu && puo"