add some documentation

src/mirall/folderwatcher.h

@@ -11,22 +11,34 @@ class INotify;
 
 namespace Mirall {
 
+/**
+ * Watches a folder and sub folders for changes
+ */
 class FolderWatcher : public QObject
 {
 Q_OBJECT
 public:
+    /**
+     * @param root Path of the root of the folder
+     */
     FolderWatcher(const QString &root, QObject *parent = 0L);
     ~FolderWatcher();
 
+    /**
+     * All watched folders and subfolders
+     */
     QStringList folders() const;
 
 signals:
+    /**
+     * Emitted when one of the paths is changed
+     */
     void folderChanged(const QString &path);
+
 protected slots:
     void slotINotifyEvent(int mask, int cookie, const QString &path);
     void slotAddFolderRecursive(const QString &path);
 private:
-
     QMutex _mutex;
     INotify *_inotify;
     QString _root;