WIP - docs(cli): add completions commands

docs/content/references/cli.mdx

@@ -36,5 +36,70 @@ The six most useful commands to users are the following:
 - **[IOTA Validator CLI](./cli/validator.mdx):** Use the `iota validator` command to access tools useful for IOTA validators.
 - **[IOTA Genesis Ceremony CLI](./cli/ceremony.mdx):** Use the `iota ceremony` command to build a genesis blob.
 
-
 Use the `help` flag for the commands that are not documented yet. For example, `iota validator --help`.  
+
+## IOTA CLI Completion
+
+Completion files can be generated per shell when using the `gen-completions` feature.
+
+```sh
+cargo install --locked --git https://github.com/iotaledger/iota.git --branch <BRANCH-NAME> --features gen-completions
+```
+
+<Tabs groupId="shell">
+
+<TabItem label="Bash" value="bash">
+
+```sh
+iota generate-completions --shell bash > ~/.iota/completion.bash
+echo "source ~/.iota/completion.bash" >> ~/.bashrc
+```
+
+</TabItem>
+
+<TabItem label="Elvish" value="elvish">
+
+TODO
+
+```sh
+iota generate-completions --shell elvish
+```
+
+</TabItem>
+
+<TabItem label="Fish" value="fish">
+
+```sh
+iota generate-completions --shell fish > iota.fish
+mv iota.fish ~/.config/fish/completions
+```
+
+</TabItem>
+
+<TabItem label="Powershell" value="powershell">
+
+TODO
+
+```sh
+iota generate-completions --shell powershell
+```
+
+</TabItem>
+
+<TabItem label="Zsh" value="zsh">
+
+In order to use zsh completions, you must first install [Oh My Zsh](https://github.com/ohmyzsh/ohmyzsh#basic-installation).
+
+Then, install [zsh-autocomplete](https://github.com/marlonrichert/zsh-autocomplete?tab=readme-ov-file#installation--setup).
+
+Finally, you can generate the completions file and install it.
+
+```sh
+iota generate-completions --shell zsh -o ~/.oh-my-zsh/completions
+```
+
+To see the completions, restart the terminal session.
+
+</TabItem>
+
+</Tabs>