Implementation of Segger RTT on nRF52832. There is unneeded code in the defines and main(commented out).

Revision:
0:ead2f457b1a2
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os-retarget-segger-rtt.lib	Fri Apr 26 17:46:21 2019 +0000
@@ -0,0 +1,1 @@
+https://github.com/0x6d61726b/mbed-os-retarget-segger-rtt/#648b5440bd2744c5356c73b9bfdf8081ca65d79a