Update documents about adding Arduino UNO R4 WiFi. Adding a description that a debug adapter is required when flashing and debugging. Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>
uno_r4
Rename directory to `uno_r4` for preparing to add Arduino UNO R4 Wifi. Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>