LED Module README (#183)

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Author: flavius-t

src/edgepi/led/README.md

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+# EdgePi LED Module
+
+# Hardware
+
+The EdgePi has an array of eight programmable LED lights. The LED module allows users to interact with each LED individually.
+
+# Example Code
+This code example demonstrates how to use the LED module to turn an LED on and off:
+```
+from edgepi.led.edgepi_leds import EdgePiLED
+from edgepi.gpio.gpio_configs import LEDPins
+
+leds = EdgePiLED()
+
+leds.turn_on(LEDPins.LED_OVR1)
+
+leds.turn_off(LEDPins.LED_OVR1)
+```
+
+# Functionalities
+
+Currently, the LED module offers the following functionalities:
+1. Turn an LED on or off.
+2. Toggle an LED to the opposite state.
+3. Read an LED's on/off state.
+
+# User Guide
+
+## Turn an LED on/off
+```
+leds.turn_on(LEDPins.LED_OVR1)
+
+leds.turn_off(LEDPins.LED_OVR1)
+```
+
+## Toggle an LED to the opposite state
+```
+leds.toggle_led(LEDPins.LED_OVR1)
+```
+
+## Read an LED's on/off state
+```
+state = leds.get_led_state(LEDPins.LED_OVR1)
+```
+
+# Limitations