microbit-dal: Added AUTHORS, and removed unused CHANGES.md file

AUTHORS

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+Joe Finney (@finneyj)
+James Devine (@jamesadevine)
+Martin Woolley (@bluetooth-mdw)
+Michał Moskal (@mmoskal)
+Robert May (@remay)
+Jonathan Protzenko (@msprotz)
+James Sheppard (@jamessheppard)
+Damien George (@dpgeorge)
+Mathew Else (@matthewelse)

CHANGES.md

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-# micro:bit BLE profile : Changes
-
-See ble _ issue _ tracker.md for Bluetooth Low Energy profile related issues