Added some more projects and libraries.

libraries/ezButton/examples/04.SingleButtonAll/04.SingleButtonAll.ino

@@ -0,0 +1,34 @@
+/*
+ * Created by ArduinoGetStarted.com
+ *
+ * This example code is in the public domain
+ *
+ * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-button-library
+ *
+ * This example:
+ *   + uses debounce for a button.
+ *   + reads state of a button
+ *   + detects the pressed and released events of a button
+ */
+
+#include <ezButton.h>
+
+ezButton button(7);  // create ezButton object that attach to pin 7;
+
+void setup() {
+  Serial.begin(9600);
+  button.setDebounceTime(50); // set debounce time to 50 milliseconds
+}
+
+void loop() {
+  button.loop(); // MUST call the loop() function first
+
+  int btnState = button.getState();
+  Serial.println(btnState);
+
+  if(button.isPressed())
+    Serial.println("The button is pressed");
+
+  if(button.isReleased())
+    Serial.println("The button is released");
+}