* Add handwired BDN9-BLE * Apply suggestions from code review Co-Authored-By: Ryan <[email protected]> * Update keyboards/handwired/bdn9_ble/rules.mk Co-Authored-By: Ryan <[email protected]> * Update keyboards/handwired/bdn9_ble/rules.mk Co-Authored-By: Ryan <[email protected]> * Update keyboards/handwired/bdn9_ble/readme.md Co-Authored-By: James Young <[email protected]> Co-authored-by: Ryan <[email protected]> Co-authored-by: James Young <[email protected]>