Add readme

Signed-off-by: Krzysztof Taborowski <[email protected]>

README.rst

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+nRF Connect SDK: sdk-sidewalk
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+This repository contains an Amazon Sidewalk platform abstraction layer fot the Nordic nRF Connect SDK which is based on Zephyr RTOS.
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+The code is in development state, it's for early evaluation and testing purposes. It shouldn't be used in production. 
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+The following repositories must be combined with sdk-sidewalk:
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+* sdk-nrf
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+Documentation
+*************
+
+Sidewalk overview:
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+* https://www.amazon.com/Amazon-Sidewalk/b/?node=21328123011
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+Official nRF Connect SDK documentation:
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+* http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest