Add Gradient_Fill example

examples/Generic/Gradient_Fill/Gradient_Fill.ino

@@ -0,0 +1,38 @@
+/*
+  This sketch demonstrates the use of the horizontal and vertical gradient
+  rectangle fill functions.
+
+  Example for library:
+  https://github.com/Bodmer/TFT_eSPI
+
+  Created by Bodmer 27/1/22
+*/
+
+#include <TFT_eSPI.h>       // Include the graphics library
+TFT_eSPI tft = TFT_eSPI();  // Create object "tft"
+
+// -------------------------------------------------------------------------
+// Setup
+// -------------------------------------------------------------------------
+void setup(void) {
+  tft.init();
+  tft.setRotation(1);
+  tft.fillScreen(TFT_DARKGREY);
+  tft.setTextFont(2);
+}
+
+// -------------------------------------------------------------------------
+// Main loop
+// -------------------------------------------------------------------------
+void loop()
+{
+  tft.fillRectHGradient(0, 0, 160, 50, TFT_MAGENTA, TFT_BLUE);
+  tft.setCursor(10,10);
+  tft.print("Horizontal gradient");
+
+  tft.fillRectVGradient(0, 60, 160, 50, TFT_ORANGE, TFT_RED);
+  tft.setCursor(10,70);
+  tft.print("Vertical gradient");
+
+  while(1) delay(100); // Wait here
+}