Add new attributes for instance

instance.go

@@ -11,6 +11,17 @@ type Instance struct {
 	Title       string            `json:"title"`
 	Description string            `json:"description"`
 	EMail       string            `json:"email"`
+	Version     string            `json:"version,omitempty"`
+	URLs        map[string]string `json:"urls,omitempty"`
+	Stats       InstanceStats     `json:"stats,omitempty"`
+	Thumbnail   string            `json:"thumbnail,omitempty"`
+}
+
+// InstanceStats hold information for mastodon instance stats.
+type InstanceStats struct {
+	UserCount   int64 `json:"user_count"`
+	StatusCount int64 `json:"status_count"`
+	DomainCount int64 `json:"domain_count"`
 }
 
 // GetInstance return Instance.