add google login

- refactor resolvers
- fix signup method typos

Resolves #17

server/resolvers/users.go

@@ -0,0 +1,31 @@
+package resolvers
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/yauthdev/yauth/server/db"
+	"github.com/yauthdev/yauth/server/graph/model"
+)
+
+func Users(ctx context.Context) ([]*model.User, error) {
+	var res []*model.User
+	users, err := db.Mgr.GetUsers()
+	if err != nil {
+		return res, err
+	}
+
+	for _, user := range users {
+		res = append(res, &model.User{
+			ID:              fmt.Sprintf("%d", user.ID),
+			Email:           user.Email,
+			SignupMethod:    user.SignupMethod,
+			FirstName:       &user.FirstName,
+			LastName:        &user.LastName,
+			Password:        &user.Password,
+			EmailVerifiedAt: &user.EmailVerifiedAt,
+		})
+	}
+
+	return res, nil
+}