Added Example files from Waveshare repo

src/WS_SD.h

@@ -0,0 +1,18 @@
+#pragma once
+#include "Arduino.h"
+#include <cstring>
+#include "FS.h"
+#include "SD_MMC.h"
+
+#define SD_CLK_PIN      48
+#define SD_CMD_PIN      47 
+#define SD_D0_PIN       45 
+
+extern uint16_t SDCard_Size;
+extern uint16_t Flash_Size;
+
+void SD_Init();
+void Flash_test();
+
+bool File_Search(const char* directory, const char* fileName);
+uint16_t Folder_retrieval(const char* directory, const char* fileExtension, char File_Name[][100],uint16_t maxFiles);