add comments

pkg/core/token_claims.go

@@ -4,13 +4,16 @@ import (
 	"github.com/dgrijalva/jwt-go"
 )
 
+// TokenType represents token type
 type TokenType byte
 
+// Token types
 const (
 	USER_TOKEN_TYPE_NORMAL      TokenType = 1
 	USER_TOKEN_TYPE_REQUIRE_2FA TokenType = 2
 )
 
+// UserTokenClaims represents user token
 type UserTokenClaims struct {
 	UserTokenId string    `json:"userTokenId"`
 	Username    string    `json:"username,omitempty"`