added readme

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+The files in this repository should be added to the standard Sensortag project from the CC2650-ble_sdk_2_02_01_18. 
+There will be some duplicates, some new, and some existing that will need to be replaced in the standard STK project.
+
+Build the project with the FLASHROM project Build config. 
+Tools used are as defined for this stack release - 
+
+TI ARM Compiler version 5.2.6
+XDC Tools 3.32.00.06 
+TI-RTOS version 2.20.01.08
+CCS6.2.0 or later (CCSv7.2 was used)
+No IAR project at the moment. 
+
+