updated doc

Author: samtholiya

website/docs/cli/commands/completion/usage.mdx renamed to website/docs/cli/commands/completion.mdx

@@ -5,6 +5,8 @@ sidebar_class_name: command
 description: Use this command to generate completion scripts for `Bash`, `Zsh`, `Fish` and `PowerShell`.
 ---
 import Screengrab from '@site/src/components/Screengrab'
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
 
 :::note Purpose
 Use this command to generate completion scripts for `Bash`, `Zsh`, `Fish` and `PowerShell`.
@@ -29,6 +31,71 @@ Run `atmos completion --help` to see all the available options
 :::
 
 
+
+<Tabs>
+  <TabItem value="bash" label="Bash" default>
+## Bash Completion Setup
+
+To enable tab completion for Atmos in `bash`, follow the steps given bellow
+
+```bash
+# execute and capture the autocompletion script
+atmos completion bash &> ~/.atmos_completion.sh
+
+# add the permissions
+chmod +x ~/.atmos_completion.sh
+```
+
+Add the following line to your `.bashrc`
+```bash
+source ~/.atmos_completion.sh
+```
+
+After saving the file, apply the changes by running:
+```bash
+source ~/.bashrc
+```
+
+Now, pressing `<Tab>` after atmos will display available subcommands.
+
+</TabItem>
+<TabItem value="zsh" name="Zsh">
+
+## Zsh Completion Setup
+
+To enable tab completion for Atmos in `Zsh`, add the following to your `~/.zshrc`:
+
+```zsh
+# Initialize Zsh completion system
+autoload -Uz compinit && compinit
+
+# Enable Atmos CLI completion
+source <(atmos completion zsh)
+
+# Improve completion behavior
+zstyle ':completion:*' menu select      # Enable menu selection
+zstyle ':completion:*' force-list always # Force vertical menu listing
+
+# Ensure the Tab key triggers autocompletion
+bindkey '\t' expand-or-complete
+```
+
+After saving the file, apply the changes by running:
+
+```zsh
+source ~/.zshrc
+```
+
+Now, pressing `<Tab>` after atmos will display available subcommands.
+
+If completions do not work, try regenerating the completion cache:
+
+```zsh
+rm -f ~/.zcompdump; compinit
+```
+</TabItem>
+</Tabs>
+
 ### Examples
 
 ```shell