Update README

README.md

@@ -1,2 +1,71 @@
+[![GitHub](https://img.shields.io/github/license/unsafe-risk/broccoli?style=for-the-badge)](https://github.com/unsafe-risk/broccoli/blob/main/LICENSE)
+[![GitHub Workflow Status (event)](https://img.shields.io/github/workflow/status/unsafe-risk/broccoli/go-test?event=push&style=for-the-badge)](https://github.com/unsafe-risk/broccoli/actions/workflows/go-test.yml)
+[![Go Reference](https://img.shields.io/badge/go-reference-%23007d9c?style=for-the-badge&logo=go)](https://pkg.go.dev/v8.run/go/broccoli)
+
 # broccoli
-Broccoli: CLI
+
+Broccoli: [CLI](https://en.wikipedia.org/wiki/Command-line_interface) Package for Go
+
+## Usage
+
+```go
+package main
+
+import (
+	"fmt"
+
+	"v8.run/go/broccoli"
+)
+
+type Config struct {
+	_    struct{} `version:"0.0.1" command:"hello" about:"Test App"`
+	Name string   `flag:"name" alias:"n" required:"true" about:"Your name"`
+
+	Sub *SubCommand `subcommand:"sub"`
+}
+
+type SubCommand struct {
+	_    struct{} `command:"sub" longabout:"Test Sub Command"`
+	Name string   `flag:"name" alias:"n" required:"true" about:"Your name"`
+}
+
+func main() {
+	var cfg Config
+	_ = broccoli.BindOSArgs(&cfg)
+
+	if cfg.Sub != nil {
+		fmt.Printf("Hello %s from sub command\n", cfg.Sub.Name)
+		return
+	}
+
+	fmt.Printf("Hello %s from main command\n", cfg.Name)
+}
+```
+
+```
+$ hello --help
+hello 0.0.1
+Test App
+
+Usage:
+        hello <COMMAND> [OPTIONS] --name <NAME> [ARGUEMENTS]
+
+Options:
+        -n, --name     Your name  (required)
+        -h, --help     Print this help message and exit
+
+Commands:
+        sub    Test Sub Command
+
+$ hello --name World
+Hello World from main command
+
+$ hello sub --name World
+Hello World from sub command
+```
+
+## Installation
+
+```bash
+go get -u v8.run/go/broccoli
+```