feat: add fish shell completions to README

README.md

@@ -135,7 +135,28 @@ compdef kubecolor=kubectl
 
 #### fish
 
-Fish completion is unsupported because fish completion is officially not supported by kubectl.
+Fish completion is officially unsupported by `kubectl`, so it is unsupported by `kubecolor` as well.
+
+However, there are 2 ways we can make them work. Please keep in mind these are a kind of "hack" and not officially supported.
+
+1. Use [evanlucas/fish-kubectl-completions](https://github.com/evanlucas/fish-kubectl-completions) with `kubecolor`:
+
+   * Install `kubectl` completions (https://github.com/evanlucas/fish-kubectl-completions):
+      ```
+      fisher install evanlucas/fish-kubectl-completions
+      ```
+   * Add the following function to your `config.fish` file:
+      ```
+      function kubectl
+        kubecolor $argv
+      end
+      ```
+2. Use [awinecki/fish-kubecolor-completions](https://github.com/awinecki/fish-kubecolor-completions)
+
+   The first way will override `kubectl` command. If you wish to preserve both `kubectl` and `kubecolor` with completions, you need to copy [evanlucas/fish-kubectl-completions](https://github.com/evanlucas/fish-kubectl-completions) for the `kubecolor` command.
+
+   For this purpose, you can use [awinecki/fish-kubecolor-completions](https://github.com/awinecki/fish-kubecolor-completions).
+
 
 ### Specify what command to execute as kubectl