added completion support

tablizer.pod

@@ -227,6 +227,54 @@ precedence over environment variables.
 
 =back
 
+=head2 COMPLETION
+
+=over
+
+=item Bash:
+
+   source <(%[1]s completion bash)
+
+To load completions for each session, execute once:
+
+  # Linux:
+  $ tablizer completion bash > /etc/bash_completion.d/%[1]s
+
+  # macOS:
+  $ tablizer completion bash > $(brew --prefix)/etc/bash_completion.d/%[1]s
+
+=item Zsh:
+
+If shell completion is not already enabled in your environment,
+you will need to enable it.  You can execute the following once:
+
+  echo "autoload -U compinit; compinit" >> ~/.zshrc
+
+To load completions for each session, execute once:
+
+  $ tablizer completion zsh > "${fpath[1]}/_%[1]s"
+
+You will need to start a new shell for this setup to take effect.
+
+=item fish:
+
+   tablizer completion fish | source
+
+To load completions for each session, execute once:
+
+   tablizer completion fish > ~/.config/fish/completions/%[1]s.fish
+
+=item PowerShell:
+
+   tablizer completion powershell | Out-String | Invoke-Expression
+
+To load completions for every new session, run:
+
+   tablizer completion powershell > tablizer.ps1
+
+and source this file from your PowerShell profile.
+
+=back
 
 =head1 BUGS