Added text mode example

examples/textmode/textmode.ino

@@ -0,0 +1,37 @@
+#include <SPI.h>
+#include "Adafruit_GFX.h"
+#include "Adafruit_RA8875.h"
+
+#define RA8875_INT 3
+#define RA8875_CS 10
+#define RA8875_RESET 9
+
+Adafruit_RA8875 tft = Adafruit_RA8875(RA8875_CS, RA8875_RESET);
+uint16_t tx, ty;
+
+void setup() 
+{
+  Serial.begin(9600);
+  Serial.println("RA8875 start");
+
+  /* Initialise the display using 'RA8875_480x272' or 'RA8875_800x480' */
+  if (!tft.begin(RA8875_800x480)) {
+    Serial.println("RA8875 Not Found!");
+    while (1);
+  }
+
+  tft.displayOn(true);
+  tft.GPIOX(true);      // Enable TFT - display enable tied to GPIOX
+  tft.PWM1config(true, RA8875_PWM_CLK_DIV1024); // PWM output for backlight
+  tft.PWM1out(255);
+  tft.fillScreen(RA8875_BLACK);
+  
+  tft.textMode();
+  tft.textTransparent(RA8875_WHITE);
+  uint8_t string[14] = "Hello, World!";
+  tft.textWrite(string, 14);
+}
+
+void loop() 
+{
+}