Import Mbed OS hard-float snapshot

connectivity/FEATURE_BLE/libraries/TARGET_CORDIO/README.md

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+# BLE API Cordio Implementation 
+
+The BLE API Cordio implementation allows Cordio licensee to easily deliver a 
+complete and up to date implementation of mbed BLE to their customers using 
+mbed OS. 
+
+To deliver a BLE port, vendors simply have to provide an HCI driver tailored 
+for the BLE module present on the board they want to support. 
+
+## Source Organization 
+
+The root contains the public header of the classes implementing BLE API public
+interface.
+
+* `doc`: Documentation such as the HCI extension guide and the 
+porting guide.
+* `driver`: HCI driver and transport interfaces. Also contains standard driver
+implementation.
+* `sources`: BLE API Implementation files 
+* `stack`: Cordio stack 
+    * `cordio_stack`: Headers and sources of the cordio stack 
+    * `mbed_os_adaptation`: Headers of the interface responsible for the bridge
+    between BLE API and the Cordio stack.
+    
+## Build time configuration
+
+Build time configuration may be controlled through options set in:
+`features\FEATURE_BLE\targets\TARGET_CORDIO\mbed_lib.json`
+
+## Documentation
+
+* [HCI architecture](doc/HCIAbstraction.md)
+* [Porting guide](doc/PortingGuide.md)