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Add documentation to the server

UI/ui_label.hpp

@@ -4,13 +4,41 @@
 
 #define UI_LABEL_TYPE std::string("ui_label")
 
+/**
+ * @brief Class representing a UI label
+ *
+ */
 class UI_label : public UI_item
 {
     Q_OBJECT
   public:
+    /**
+     * @brief Construct a UI label object
+     *
+     * @param text The text to display
+     * @param fg_color The foreground color
+     * @param bg_color The background color
+     * @param parent The parent QObject
+     */
     UI_label(std::string text, Color fg_color, Color bg_color, QObject *parent = nullptr);
+    /**
+     * @brief Construct a UI label object
+     *
+     * @param parent The parent QObject
+     */
     UI_label(QObject *parent = nullptr);
 
+    /**
+     * @brief Deserialize the label from JSON
+     *
+     * @param j The JSON object
+     */
     void from_json(const json &j) override;
+    /**
+     * @brief Serialize the label to JSON
+     *
+     * @param id The id of the label
+     * @return json The JSON representation of the label
+     */
     json to_json(size_t id) const override;
 };