message: docs: add MacPorts instructions
diff: @@ -24,6 +24,7 @@ A cross-platform graphical process/system monitor with a customizable interface
  - [Gentoo](#gentoo)
  - [Nix](#nix)
  - [Solus](#solus)
  + - [MacPorts](#macports)
  - [Homebrew](#homebrew)
  - [Scoop](#scoop)
  - [Chocolatey](#chocolatey)
  @@ -213,6 +214,13 @@ brew install bottom
  brew install clementtsang/bottom/bottom
  ```
  +### MacPorts
  +
  +```bash
  +sudo port selfupdate
  +sudo port install bottom
  +```
  +
  ### Scoop
  ```bash
  