Added README file

README.md

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+# Adafruit Circuit Playground Library
+Library to program [Circuit Playground Classic](https://www.adafruit.com/product/3000) and [Circuit Playground Express](https://www.adafruit.com/product/3333) in C++ with the Arduino IDE.
+
+## Installation
+On the Arduino IDE (v. 1.8.5+) use the Library Manager in order to install this library. Documentation can be found on the Adafruit's learning
+
+## Usage
+
+This Readme is not as exhaustive as the example code or the official documentation that can be found [here (CPX)](https://learn.adafruit.com/adafruit-circuit-playground-express) and [here (CPC)](https://learn.adafruit.com/introducing-circuit-playground).
+It is intended to be a reference where to find the listing of the library's functions at a glance.
+
+
+### List of the methods in the `Adafruit_CircuitPlayground` class
+
+
+- **Red LED**
+  - `void redLED(boolean v)`
+
+
+- **Slide Switch**
+  - `boolean slideSwitch(void)`
+
+
+- **Push Buttons**
+  - Left : `boolean leftButton(void)`
+  - Right : `boolean rightButton(void)`
+
+
+- **Light Sensor**
+  - `uint16_t lightSensor(void)`
+
+
+- **Neopixels**
+  - `void clearPixels(void)`
+  - `void setPixelColor(uint8_t p, uint32_t c)`
+  - `void setPixelColor(uint8_t p, uint8_t r, uint8_t g, uint8_t b)`
+  - `void setBrightness(uint16_t b)`
+  - `uint32_t colorWheel(uint8_t x)`
+  - Basic color detection:
+    - `void senseColor(uint8_t& red, uint8_t& green, uint8_t& blue)`
+    - ` uint32_t senseColor()`
+
+
+
+- **Capacitive touch**
+  - `uint16_t readCap(uint8_t p, uint8_t samples=10)`
+
+
+- **Temperature sensor**
+  - Celsius : `float temperature(void)`
+  - Farenheit `float temperatureF(void)`
+
+
+- **Microphone**
+  - `uint16_t soundSensor(void)`
+
+
+- **Buzzer**
+  - `void playTone(uint16_t freq, uint16_t time, boolean wait=true)`
+
+
+- **Accelerometer**
+  - `float motionX(void)`
+  - `float motionY(void)`
+  - `float motionZ(void)`
+
+
+- **Infra Red** _[Circuit Playground Express only]_    
+  IR send and receive LEDs are used via the [`IRLib2`](https://github.com/cyborg5/IRLib2) Library and are accessible via the `irSend` and `irReceiver` properties of the `Adafruit_CircuitPlayground` class