Add shell completion templates and manpage template

src/templates/completion-bash.handlebars

@@ -0,0 +1,43 @@
+# bash completion for {{spec.name}} v{{spec.version}} #
+# Auto-generated by cli-spec-generator
+
+{{spec.name}}() {
+    local cur prev words cword
+    _init_completion || return
+
+    # Main commands
+    if [[ $cword -eq 1 ]]; then
+        COMPREPLY=( $( compgen -W '
+            {{#each spec.commands}}
+            {{name}}{{#if aliases}} {{aliases}}{{/if}}
+            {{/each}}
+            --help
+            --version
+        ' -- "$cur" ) )
+        return
+    fi
+
+    # Command-specific options and arguments
+    local cmd="${words[1]}"
+    case "$cmd" in
+        {{#each spec.commands}}
+        {{name}})
+            if [[ "$prev" == "--"* ]]; then
+                COMPREPLY=( $( compgen -W '
+                    {{#each options}}
+                    --{{name}}{{#if short}} -{{short}}{{/if}}
+                    {{/each}}
+                    --help
+                ' -- "$cur" ) )
+            else
+                COMPREPLY=( $( compgen -W '
+                    {{#each options}}
+                    --{{name}}{{#if short}} -{{short}}{{/if}}
+                    {{/each}}
+                    --help
+                ' -- "$cur" ) )
+            fi
+            ;;
+        {{/each}}
+    esac
+} && complete -F {{spec.name}} {{spec.name}}