doc(pan-cordio): Add toolchain version used to compile cordio-ll readme

Author: Steve Cartmell

features/FEATURE_BLE/targets/TARGET_CORDIO_LL/cordio_stack/README.md

@@ -18,3 +18,8 @@ the folders contain the public headers to interface with it.
 
 * `controller`: HCI Controller headers
 * `platform`: Platform headers
+
+
+## Library information
+
+Compiled with: GNU Arm Embedded Toolchain 6-2017-q2-update

features/FEATURE_BLE/targets/TARGET_NORDIC/TARGET_NORDIC_CORDIO/TARGET_NRF5x/cordio_stack/README.md

@@ -5,3 +5,7 @@ platforms to interface with the cordio link layer platform API.
 
 The binary is contained in `libcordio_stack_nordic.a` and the public headers are
 contained in the `platform` directory.
+
+## Library information
+
+Compiled with: GNU Arm Embedded Toolchain 6-2017-q2-update