added examples

example_test.go

@@ -0,0 +1,30 @@
+package jwt_test
+
+import (
+	"fmt"
+	"github.com/dgrijalva/jwt-go"
+	"time"
+)
+
+func ExampleParse(myToken string, myLookupKey func(interface{}) (interface{}, error)) {
+	token, err := jwt.Parse(myToken, func(token *jwt.Token) (interface{}, error) {
+		return myLookupKey(token.Header["kid"])
+	})
+
+	if err == nil && token.Valid {
+		fmt.Println("Your token is valid.  I like your style.")
+	} else {
+		fmt.Println("This token is terrible!  I cannot accept this.")
+	}
+}
+
+func ExampleNew(mySigningKey string) (string, error) {
+	// Create the token
+	token := jwt.New(jwt.SigningMethodHS256)
+	// Set some claims
+	token.Claims["foo"] = "bar"
+	token.Claims["exp"] = time.Now().Add(time.Hour * 72).Unix()
+	// Sign and get the complete encoded token as a string
+	tokenString, err := token.SignedString(mySigningKey)
+	return tokenString, err
+}