mysql-macports: add README (#8210)

plugins/mysql-macports/README.md

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+# MySQL-Macports plugin
+
+This plugin adds aliases for some of the commonly used [MySQL](https://www.mysql.com/) commands when installed using [MacPorts](https://www.macports.org/) on macOS.
+
+To use it, add `mysql-macports` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... mysql-macports)
+```
+
+For instructions on how to install MySQL using MacPorts, read the [MacPorts wiki](https://trac.macports.org/wiki/howto/MySQL/).
+
+## Aliases
+
+| Alias        | Command                                                   | Description                                |
+| ------------ | --------------------------------------------------------- | ------------------------------------------ |
+| mysqlstart   | `sudo /opt/local/share/mysql5/mysql/mysql.server start`   | Start the MySQL server.                    |
+| mysqlstop    | `sudo /opt/local/share/mysql5/mysql/mysql.server stop`    | Stop the MySQL server.                     |
+| mysqlrestart | `sudo /opt/local/share/mysql5/mysql/mysql.server restart` | Restart the MySQL server.                  |
+| mysqlstatus  | `mysqladmin5 -u root -p ping`                             | Check whether the MySQL server is running. |