Added readme.md.
Added readme.md.

tdautc19841202/LoRaMac-node,seanelaval/LoRaMac-node,alexsuslov/LoRaMac-node,imec-idlab/LoRaMac-node,reixd/LoRaMac-node,seanelaval/LoRaMac-node,imec-idlab/LoRaMac-node,tunghd/LoRaMac-node,AlexanderWiniger/LoRaMac-node,tdautc19841202/LoRaMac-node,a3rd/LoRaMac-node,abouillot/LoRaMac-node,tdautc19841202/LoRaMac-node,reixd/LoRaMac-node,alexsuslov/LoRaMac-node,a3rd/LoRaMac-node,alexsuslov/LoRaMac-node,AlexanderWiniger/LoRaMac-node,a3rd/LoRaMac-node,seanelaval/LoRaMac-node,abouillot/LoRaMac-node,tunghd/LoRaMac-node,AlexanderWiniger/LoRaMac-node,tunghd/LoRaMac-node