breakup v2 documentation

docs/v2/examples/subcommands-categories.md

@@ -0,0 +1,47 @@
+For additional organization in apps that have many subcommands, you can
+associate a category for each command to group them together in the help
+output, e.g.:
+
+```go
+package main
+
+import (
+	"log"
+	"os"
+
+	"github.com/urfave/cli/v2"
+)
+
+func main() {
+	app := &cli.App{
+		Commands: []*cli.Command{
+			{
+				Name: "noop",
+			},
+			{
+				Name:     "add",
+				Category: "template",
+			},
+			{
+				Name:     "remove",
+				Category: "template",
+			},
+		},
+	}
+
+	if err := app.Run(os.Args); err != nil {
+		log.Fatal(err)
+	}
+}
+```
+
+Will include:
+
+```
+COMMANDS:
+  noop
+
+  Template actions:
+    add
+    remove
+```