Added docs

Author: karlsoderby

docs/api.md

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+# Ardunio Low Power
+
+## Methods
+
+### `LowPower.idle()`
+
+#### Description
+
+Puts the MCU in IDLE mode. This mode allows power optimization with the fastest wake-up time. The CPU is stopped. To further reduce power consumption, the user can manually disable the clocking of modules and clock sources.
+
+
+#### Syntax
+
+```
+LowPower.idle();
+LowPower.idle(milliseconds);
+```
+
+#### Parameters
+
+milliseconds: the number of milliseconds to put the board in idle mode. If void the idle mode is used till a wakeup event.
+
+### `LowPower.sleep()`
+
+#### Description
+
+Puts the MCU in sleep mode. The sleep mode allows power optimization with a slower wakeup time. Only the chosen peripherals are on.
+
+
+#### Syntax
+
+```
+LowPower.sleep();
+LowPower.sleep(milliseconds);
+```
+
+#### Parameters
+
+milliseconds: the number of milliseconds to put the board in sleep mode. If void the sleep mode is used till a wakeup event.
+
+### `LowPower.deepSleep()`
+
+#### Description
+
+Puts the MCU in deep sleep mode. The deep sleep mode allows power optimization with the slowest wake-up time. All but the RTC peripherals are stopped. The CPU can be wakeup only using RTC or wakeup on interrupt capable pins.
+
+
+#### Syntax
+
+```
+LowPower.deepSleep();
+LowPower.deepSleep(milliseconds);
+```
+
+#### Parameters
+
+milliseconds: the number of milliseconds to put the board in deep sleep mode. If void the deep sleep mode is used till a wakeup event.
+
+### `LowPower.attachInterruptWakeup()`
+
+#### Description
+
+Indicates the function to call and the conditions for a wakeup event.
+
+
+#### Syntax
+
+```
+LowPower.attachInterruptWakeup(pin, callback, mode);
+```
+
+#### Parameters
+
+pin: the pin used as external wakeup
+
+callback: the function to call on wakeup
+
+mode: the transitions to sense on the indicated pin. Can be one between:
+
+- FALLING
+- RISING
+- CHANGE
+
+### `LowPower.CompanionLowPowerCallback()`
+
+#### Description
+
+Indicates the function that the on-boad co-processor (Tian only) has to call just before going to sleep.
+
+
+#### Syntax
+
+LowPower.CompanionLowPowerCallback(callback);
+
+#### Parameters
+
+callback: the function to call before going to sleep
+
+### `LowPower.companionSleep()`
+
+#### Description
+
+Puts the on-board co-processor (Tian only) in sleep mode
+
+
+#### Syntax
+
+LowPower.companionSleep();
+
+#### Parameters
+
+None
+
+### `LowPower.companionWakeup()`
+
+#### Description
+
+Forces the on board co-processor (Tian only) wakeup from sleep mode.
+
+
+#### Syntax
+
+```
+LowPower.companionWakeup();
+```
+
+#### Parameters
+
+None
+
+## Examples
+
+- [ExternalWakeup](https://github.com/arduino-libraries/ArduinoLowPower/blob/master/examples/ExternalWakeup/ExternalWakeup.ino) : Demonstrates how to wake your board from an external source like a button.
+- [TianStandby](https://github.com/arduino-libraries/ArduinoLowPower/blob/master/examples/TianStandby/TianStandby.ino) : Demonstrates how to put a Tian in standby
+- [TimedWakeup](https://github.com/arduino-libraries/ArduinoLowPower/blob/master/examples/TimedWakeup/TimedWakeup.ino) : Demonstrates how to put in sleep your board for a certain amount of time

docs/readme.md

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+# Arduino Low Power Library
+
+This library allows you to use the low power features of the SAMD21 MCU, which is used for all [MKR family boards](https://store.arduino.cc/collections/mkr-family) and the [Nano 33 IoT board](https://store.arduino.cc/products/arduino-nano-33-iot).
+
+In these pages, the term companion chip is used. This term refers to a board co-processor like the MIPS processor on the [Arduino Tian](https://docs.arduino.cc/retired/boards/arduino-tian).
+
+To use this library:
+
+```
+#include "<ArduinoLowPower.h>"
+```