Initial Marktplaats SDK scaffold

Clone the twdehands SDK into mrktplaats and retarget naming and defaults for app.marktplaats.nl while keeping the same request/response bodies and endpoint behavior.

user.go

@@ -0,0 +1,54 @@
+package mrktplaats
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+)
+
+// UserService handles user profiles and reviews.
+type UserService struct {
+	t *transport
+}
+
+// UserInfoResponse wraps the user profile.
+type UserInfoResponse struct {
+	User User `json:"user"`
+}
+
+// Me returns the authenticated user's profile.
+func (s *UserService) Me(ctx context.Context) (*User, error) {
+	var resp UserInfoResponse
+	if err := s.t.get(ctx, "/app/my-account/profile/v2/user-info/user", nil, &resp); err != nil {
+		return nil, err
+	}
+	return &resp.User, nil
+}
+
+// ReviewsResponse contains reviews and summary statistics.
+type ReviewsResponse struct {
+	Summary ReviewSummary `json:"summary"`
+	Reviews []Review      `json:"reviews"`
+}
+
+// ReviewRole determines which reviews to fetch.
+type ReviewRole string
+
+const (
+	ReviewRoleAll      ReviewRole = ""
+	ReviewRoleReviewee ReviewRole = "reviewee"
+)
+
+// Reviews returns reviews for a user, optionally filtered by role.
+func (s *UserService) Reviews(ctx context.Context, userID int, role ReviewRole) (*ReviewsResponse, error) {
+	path := fmt.Sprintf("/app/user-review/v1/reviews/%d", userID)
+	params := url.Values{}
+	if role != "" {
+		params.Set("role", string(role))
+	}
+	var resp ReviewsResponse
+	if err := s.t.get(ctx, path, params, &resp); err != nil {
+		return nil, err
+	}
+	return &resp, nil
+}