Demonstrate queue proper functionality

Author: facchinm

examples/Enqueue_test/Enqueue.inot

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+void setup() {
+  // put your setup code here, to run once:
+
+}
+
+int i = 0;
+
+void loop() {
+  // Continuously pump counter
+  delay(100);
+  i++;
+  counter = i;
+}

examples/Enqueue_test/Enqueue_test.ino

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+void setup() {
+  // put your setup code here, to run once:
+  Serial.begin(115200);
+  while (!Serial) {}
+  Enqueue.start();
+  Serial.println("start");
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  delay(1000);
+  for (int i = 0; i < 10; i++) {
+    Serial.println(counter);
+  }
+}

examples/Enqueue_test/SharedVariables.h

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+Shared<int> counter;