Add README

README.md

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 # AudioMoth-Firmware-Basic
 Basic firmware for AudioMoth devices, usable in conjunction with the AudioMoth-Project framework.
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+Compatible with the [AudioMoth Configuration app](https://github.com/OpenAcousticDevices/AudioMoth-Config-App). For usage instructions, visit [Open Acoustic Devices](https://www.openacousticdevices.info/getting-started).
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+### Usage ####
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+Clone the contents of [AudioMoth-Project](https://github.com/OpenAcousticDevices/AudioMoth-Project).
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+Replace ```src/main.c``` with this repository.
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+### License ###
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+Copyright 2017 [Open Acoustic Devices](http://www.openacousticdevices.info/).
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+[MIT license](http://www.openacousticdevices.info/license).