Now can display a monochrome image from byte array + added slow/fast init display routine

Client/main/main.cpp

@@ -15,6 +15,8 @@
 #include "network.hpp"
 #include "provider.hpp"
 
+#include "test_image.h"
+
 static const char *TAG = "ClientMain";
 
 extern "C" void app_main()
@@ -76,7 +78,8 @@ extern "C" void app_main()
   ESP_LOGI(TAG, "Initializing EPD");
   epd_init();
   epd_init_display();
-  epd_clear(epd_color_t::WHITE);
+  // epd_clear(epd_color::WHITE);
+  epd_draw_bitmap(epd_color::WHITE, test_image);
   epd_refresh();
   epd_shutdown_display();