added the TFT display library

libraries/TFT/examples/Arduino/TFTEtchASketch/TFTEtchASketch.ino

@@ -0,0 +1,84 @@
+/*
+
+ TFT EtchASketch
+ 
+ This example for the Arduino screen draws a white point
+ on the GLCD based on the values of 2 potentiometers. 
+ To clear the screen, press a button attached to pin 2.
+ 
+ This example code is in the public domain.
+ 
+ Created 15 April 2013 by Scott Fitzgerald
+ 
+ http://arduino.cc/en/Tutorial/TFTEtchASketch
+ 
+ */
+ 
+#include <TFT.h>  // Arduino LCD library
+#include <SPI.h>
+
+// pin definition for the Uno
+#define cs   10
+#define dc   9
+#define rst  8  
+
+// pin definition for the Leonardo
+// #define cs   7
+// #define dc   0
+// #define rst  1 
+
+TFT TFTscreen = TFT(cs, dc, rst);
+
+// initial position of the cursor
+int xPos = TFTscreen.width()/2;
+int yPos = TFTscreen.height()/2;
+
+// pin the erase switch is connected to
+int erasePin = 2;
+
+void setup() {
+  // declare inputs
+  pinMode(erasePin, INPUT);
+  // initialize the screen
+  TFTscreen.begin();
+  // make the background black
+  TFTscreen.background(0,0,0); 
+}
+
+void loop()
+{
+  // read the potentiometers on A0 and A1 
+  int xValue = analogRead(A0);
+  int yValue = analogRead(A1);
+
+  // map the values and update the position
+  xPos = xPos + (map(xValue, 0, 1023, 2, -2));
+  yPos = yPos + (map(yValue, 0, 1023, -2, 2));
+  
+// don't let the point go past the screen edges
+  if(xPos > 159){
+    (xPos = 159);
+  }
+
+  if(xPos < 0){
+    (xPos = 0);
+  }
+  if(yPos > 127){
+    (yPos = 127);
+  }
+
+  if(yPos < 0){
+    (yPos = 0);
+  }
+  
+  // draw the point
+  TFTscreen.stroke(255,255,255);
+  TFTscreen.point(xPos,yPos);
+
+  // read the value of the pin, and erase the screen if pressed
+  if(digitalRead(erasePin) == HIGH){
+    TFTscreen.background(0,0,0);
+  }
+
+  delay(33);            
+}