docs(examples): add a basic and a more complex example in examples dir

examples/basic/basic.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/romdo/go-validate"
+)
+
+type Order struct {
+	Books []*Book `json:"books"`
+}
+
+type Book struct {
+	Title  string `json:"title"`
+	Author string `json:"author"`
+}
+
+func (s *Book) Validate() error {
+	var errs error
+	if s.Title == "" {
+		errs = validate.Append(errs, &validate.Error{
+			Field: "Title", Msg: "is required",
+		})
+	}
+
+	// Helper to perform the same kind of check as above for Title.
+	errs = validate.Append(errs, validate.RequireField("Author", s.Author))
+
+	return errs
+}
+
+func main() {
+	errs := validate.Validate(&Order{Books: []*Book{{Title: ""}}})
+
+	for _, err := range validate.Errors(errs) {
+		fmt.Println(err.Error())
+	}
+}