feat(sprite): Add completions for sprite

sprite is the CLI tool for https://docs.sprites.dev

Signed-off-by: Jonathan Stacks <jonstacks@users.noreply.github.com>

plugins/sprite/README.md

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+# sprite plugin
+
+This plugin adds completion for the [Sprites CLI](https://docs.sprites.dev/cli/installation) (`sprite`).
+
+To use it, add `sprite` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... sprite)
+```
+
+This plugin does not add any aliases.
+
+## Cache
+
+This plugin caches the completion script and is automatically updated asynchronously when the plugin is
+loaded, which is usually when you start up a new terminal emulator.
+
+The cache is stored at:
+
+- `$ZSH_CACHE_DIR/completions/_sprite` completions script