worked on FileSystem, started to migrate logging class

ext/sd/fat32/FreeClusterIterator.h

@@ -0,0 +1,14 @@
+#pragma once
+
+/** helper class to iterate all free clusters of the Filesystem */
+class FreeClusterIterator {
+
+	FS& fs;
+
+public:
+
+	FreeClusterIterator(FS& fs) : fs(fs) {
+
+	}
+
+};