Add Bluetooth examples

Co-authored-by: Peter Harper <77111776+peterharperuk@users.noreply.github.com>

pico_w/wifi/freertos/CMakeLists.txt

@@ -0,0 +1,8 @@
+if (NOT FREERTOS_KERNEL_PATH AND NOT DEFINED ENV{FREERTOS_KERNEL_PATH})
+    message("Skipping Pico W FreeRTOS examples as FREERTOS_KERNEL_PATH not defined")
+else()
+    include(FreeRTOS_Kernel_import.cmake)
+
+    add_subdirectory(iperf)
+    add_subdirectory(ping)
+endif()