feat(charm): add plugin for charm (#10803)

plugins/charm/README.md

@@ -0,0 +1,9 @@
+# Charm plugin
+
+This plugin adds completion for the [charm](https://github.com/charmbracelet/charm) CLI.
+
+To use it, add `charm` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... charm)
+```