feat(rclone): introduce rclone plugin

plugins/rclone/README.md

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+# Rclone plugin
+
+This plugin adds completion for [Rclone](https://rclone.org/), the command-line program to manage files on cloud storage.
+
+To use it, add `rclone` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... rclone)
+```

plugins/rclone/rclone.plugin.zsh

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+# Completion
+if (( ! $+commands[rclone] )); then
+  return
+fi
+
+# If the completion file doesn't exist yet, we need to autoload it and
+# bind it to `rclone`. Otherwise, compinit will have already done that.
+if [[ ! -f "$ZSH_CACHE_DIR/completions/_rclone" ]]; then
+  typeset -g -A _comps
+  autoload -Uz _rclone
+  _comps[rclone]=_rclone
+fi
+
+rclone completion zsh - >| "$ZSH_CACHE_DIR/completions/_rclone" &|