feat: add joystick demo

src/main.cpp

@@ -1,4 +1,8 @@
 #include <Arduino.h>
+#include <LibPrintf.h>
+#include "joystick.hpp"
+
+Joystick joystick;
 
 void setup() {
   Serial.begin(9600);
@@ -11,11 +15,12 @@ void setup() {
 }
 
 void loop() {
-  Serial.println("ping");
-  digitalWrite(LED_BUILTIN, HIGH);
-  delay(1000);
+  double x = joystick.getX();
+  double y = joystick.getY();
+  bool pressed = joystick.isPressed();
 
-  Serial.println("pong");
-  digitalWrite(LED_BUILTIN, LOW);
-  delay(1000);
-}
+  printf("X: %.2f | Y: %.2f | Pressed: %s\n", x, y, pressed ? "Yes" : "No");
+
+  digitalWrite(LED_BUILTIN, pressed ? HIGH : LOW);
+
+  delay(500);}