Add instructions for enabling fish auto-completions for kubectl

content/en/docs/tasks/tools/included/optional-kubectl-configs-fish.md

@@ -0,0 +1,15 @@
+---
+title: "fish auto-completion"
+description: "Optional configuration to enable fish shell auto-completion."
+headless: true
+---
+
+The kubectl completion script for Fish can be generated with the command `kubectl completion fish`. Sourcing the completion script in your shell enables kubectl autocompletion.
+
+To do so in all your shell sessions, add the following line to your `~/.config/fish/config.fish` file:
+
+```shell
+kubectl completion fish | source
+```
+
+After reloading your shell, kubectl autocompletion should be working.