add the prototypes of the examples

examples/lv_examples.h

@@ -0,0 +1,41 @@
+/**
+ * @file lv_examples.h
+ *
+ */
+
+#ifndef LV_EXAMPLES_H
+#define LV_EXAMPLES_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "styles/lv_example_style.h"
+#include "get_started/lv_example_get_started.h"
+#include "widgets/lv_example_widgets.h"
+#include "layouts/lv_example_layout.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+/**********************
+ *      MACROS
+ **********************/
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /*LV_EXAMPLES_H*/