tests/sys_arduino_analog: add test application

The goal of this application is to test the analogRead and analogWrite Arduino function

tests/sys_arduino_analog/Makefile

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+BOARD ?= arduino-zero
+
+include ../Makefile.tests_common
+
+LED_PIN ?= 3
+
+USEMODULE += arduino
+
+# Features used by Arduino analogRead/analogWrite functions are required
+FEATURES_REQUIRED += arduino_pwm
+FEATURES_REQUIRED += periph_adc
+
+CFLAGS += -DLED_PIN=$(LED_PIN)
+
+include $(RIOTBASE)/Makefile.include

tests/sys_arduino_analog/arduino-test.sketch

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+// Example sketch given in analogWrite documentation
+// https://www.arduino.cc/reference/en/language/functions/analog-io/analogwrite/
+
+int ledPin = LED_PIN;         // LED connected to digital pin 3 by default
+int analogPin = 1;            // potentiometer connected to analog pin 1
+int val = 0;                  // variable to store the read value
+
+void setup() {
+  pinMode(ledPin, OUTPUT);    // sets the pin as output
+}
+
+void loop() {
+  val = analogRead(analogPin);  // read the input pin
+  analogWrite(ledPin, val / 4); // analogRead values go from 0 to 1023, analogWrite values from 0 to 255
+}