Update README.md

Author: khoih-prog

README.md

@@ -13,6 +13,12 @@ It is tested and working with
 1. The `ESP8266` Arduino platform with a recent stable release [`ESP8266 Core 2.6.2 or newer`] (https://github.com/esp8266/Arduino)
 2. The `ESP32` Arduino platform with a recent stable release [`ESP32 Core 1.0.4 or newer`] (https://github.com/espressif/arduino-esp32)
 
+### Quick Start
+
+#### Installing
+
+The easiest way is to use `Arduino Library Manager`. Search for `ESP_DoubleResetDetector`, then select / install the latest version.
+
 ### Releases
 #### New in v1.0.1
 
@@ -24,3 +30,77 @@ It is tested and working with
 
 Detects a double reset so that an alternative start-up mode can be used. One example use is to allow re-configuration of a device's wifi credentials.
 
+### Usage
+
+How to use
+
+```cpp
+// These defines must be put before #include <ESP_DoubleResetDetector.h>
+// to select where to store DoubleResetDetector's variable.
+// For ESP32, You must select one to be true (EEPROM or SPIFFS)
+// For ESP8266, You must select one to be true (RTC, EEPROM or SPIFFS)
+// Otherwise, library will use default EEPROM storage
+#define ESP_DRD_USE_EEPROM      false
+#define ESP_DRD_USE_SPIFFS      true    //false
+
+#ifdef ESP8266
+  #define ESP8266_DRD_USE_RTC     false   //true
+#endif
+
+#define DOUBLERESETDETECTOR_DEBUG       true  //false
+
+#include <ESP_DoubleResetDetector.h>      //https://github.com/khoih-prog/ESP_DoubleResetDetector
+
+// Number of seconds after reset during which a 
+// subseqent reset will be considered a double reset.
+#define DRD_TIMEOUT 10
+
+// RTC Memory Address for the DoubleResetDetector to use
+#define DRD_ADDRESS 0
+
+DoubleResetDetector* drd;
+
+void setup()
+{
+  pinMode(LED_BUILTIN, OUTPUT);
+  
+  Serial.begin(115200);
+  Serial.println("\Starting");
+  
+  drd = new DoubleResetDetector(DRD_TIMEOUT, DRD_ADDRESS);
+
+  if (drd->detectDoubleReset()) 
+  {
+    Serial.println("Double Reset Detected");
+    digitalWrite(LED_BUILTIN, LOW);
+  } 
+  else 
+  {
+    Serial.println("No Double Reset Detected");
+    digitalWrite(LED_BUILTIN, HIGH);
+  }
+}
+
+void loop()
+{
+  // Call the double reset detector loop method every so often,
+  // so that it can recognise when the timeout expires.
+  // You can also call drd.stop() when you wish to no longer
+  // consider the next reset as a double reset.
+  drd->loop();
+}
+```
+### TO DO
+
+1. Search for bug and improvement.
+2. Similar features for Arduino (UNO, Mega, etc...)
+
+### Contributing
+If you want to contribute to this project:
+- Report bugs and errors
+- Ask for enhancements
+- Create issues and pull requests
+- Tell other people about this library
+
+### Copyright
+Copyright 2019- Khoi Hoang