feat: add example to get data from zipcode in readme

README.md

@@ -1,2 +1,36 @@
 # brasilapi-go
 Cliente em Golang para se comunicar com BrasilApi
+
+## Cep (zipcode)
+Para buscar dados referente a um CEP basta utilizar a função `GetZipCode(zipcode)`
+
+```go
+package main
+
+import (
+	"fmt"
+
+	"github.com/isaqueveras/brasilapi-go"
+)
+
+func main() {
+	zp, err := brasilapi.GetZipCode("63900-193")
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	fmt.Println(*zp.Cep)
+	fmt.Println(*zp.City)
+	fmt.Println(*zp.Service)
+	fmt.Println(*zp.State)
+
+	if zp.Location != nil {
+		fmt.Println(*zp.Location.Type)
+	}
+
+	if zp.Location != nil && zp.Location.Coordenates != nil {
+		fmt.Println(*zp.Location.Coordenates.Longitude)
+		fmt.Println(*zp.Location.Coordenates.Latitude)
+	}
+}
+```