add an example for read contents from flash

[dylanZh]

Hi,
I can run the demo on Pi OS after I update the GPIO setting
typedef enum {
GPIO_CS = 525,// 13,
GPIO_PD = 531,//19,
GPIO_INT = 538//26
} gpio_name;

but I am stuck to read an image from flash according to the guide
https://riverdi.com/knowledge-base/eve4-getting-started

I used the function Load_ImageASTC() but always no image show on the LCD.
I am wondering if you can add an example for reading image from flash thanks

Best regards
Dylan