add arduino test sketch for touchscreen reading

tests/arduino_touchscreen_test/arduino_touchscreen_test.ino

@@ -0,0 +1,38 @@
+void setup() {
+  // put your setup code here, to run once:
+  Serial.begin(9600);
+  Serial.println("\"setup\"");
+  
+}
+
+class Panel {
+  int A,B;
+public:
+  Panel(int one, int two) : A(one), B(two) {
+    pinMode(A, OUTPUT);
+    pinMode(B, OUTPUT);  
+  }
+ 
+  int Y() {
+    digitalWrite(A, 1);
+    int result = analogRead(B);
+    digitalWrite(A, 0);
+    return result;
+  }
+  
+  int X() {
+    digitalWrite(B, 1);
+    int result = analogRead(A);
+    digitalWrite(B, 0);
+    return result;
+  }
+  
+} panel(A0,A1);
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  Serial.print(panel.X());
+  Serial.print("\t");
+  Serial.println(panel.Y());
+  delay(100);
+}