Add Bluetooth examples

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

pico_w/wifi/blink/CMakeLists.txt

@@ -0,0 +1,14 @@
+add_executable(picow_blink
+        picow_blink.c
+        )
+
+target_link_libraries(picow_blink
+        pico_stdlib              # for core functionality
+        pico_cyw43_arch_none     # we need Wifi to access the GPIO, but we don't need anything else
+        )
+
+# create map/bin/hex file etc.
+pico_add_extra_outputs(picow_blink)
+
+# add url via pico_set_program_url
+example_auto_set_url(picow_blink)