add validation README

+validation
+==============
+
+validation is a form validation for a data validation and error collecting using Go.
+
+## Installation and tests
+
+Install:
+
+	go get github.com/astaxie/beego/validation
+
+Test:
+
+	go test github.com/astaxie/beego/validation
+
+## Example
+
+	import (
+		"github.com/astaxie/beego/validation"
+		"log"
+	)
+
+	type User struct {
+		Name string
+		Age int
+	}
+
+	func main() {
+		u := User{"man", 40}
+		valid := validation.Validation{}
+		valid.Required(u.Name, "name")
+		valid.MaxSize(u.Name, 15, "nameMax")
+		valid.Range(u.Age, 0, 140, "age")
+		if valid.HasErrors {
+			// validation does not pass
+			// print invalid message
+			for _, err := range valid.Errors {
+				log.Println(err.Key, err.Message)
+			}
+		}
+		// or use like this
+		if v := valid.Max(u.Age, 140); !v.Ok {
+			log.Println(v.Error.Key, v.Error.Message)
+		}
+	}
+
+
+## LICENSE
+
+BSD License http://creativecommons.org/licenses/BSD/

@@ -31,7 +31,7 @@ func TestRequired(t *testing.T) {
 		t.Error("empty slice should be false")
 	}
 	if !valid.Required([]interface{}{"ok"}, "slice").Ok {
-		t.Error("slice should  be equal true")
+		t.Error("slice should be true")
 	}
 }