feat: Add uuid CLI

```bash
go install github.com/cmackenzie1/go-uuid/cmd/uuid

uuid
5f70a1c2-de1b-4e23-b8f8-d86889ac88a1
```

README.md

@@ -7,6 +7,18 @@ A simple, stdlib only, go module for generating UUIDs (**U**niversally **U**niqu
 
 ## Installation
 
+### CLI
+
+```bash
+go install github.com/cmackenzie1/go-uuid/cmd/uuid
+
+# run the command
+uuid
+5f70a1c2-de1b-4e23-b8f8-d86889ac88a1
+```
+
+### Package
+
 ```bash
 go get github.com/cmackenzie1/go-uuid
 ```

cmd/uuid/main.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/cmackenzie1/go-uuid"
+)
+
+func run(version int, count int, uppercase bool) error {
+	for i := 0; i < count; i++ {
+		var id uuid.UUID
+		var err error
+		if version == 4 {
+			id, err = uuid.NewV4()
+		} else {
+			id, err = uuid.NewV7()
+		}
+		if err != nil {
+			return err
+		}
+		if uppercase {
+			fmt.Println(strings.ToUpper(id.String()))
+		} else {
+			fmt.Println(id)
+		}
+	}
+	return nil
+}
+
+func main() {
+	v := flag.Int("v", 4, "UUID version to generate.Supported versions are 4 and 7.")
+	n := flag.Int("c", 1, "Number of UUIDs to generate.")
+	u := flag.Bool("u", false, "Print UUIDs in uppercase.")
+	flag.Parse()
+
+	if *v != 4 && *v != 7 {
+		fmt.Printf("Unsupported UUID version: %d\n", *v)
+		os.Exit(1)
+	}
+
+	if *n < 1 {
+		fmt.Printf("Number of UUIDs to generate must be greater than 0.\n")
+		os.Exit(1)
+	}
+
+	if err := run(*v, *n, *u); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}