Add biantin keyboard

biantin/boards/arm/piantor_pro_bt/Kconfig.defconfig

@@ -0,0 +1,41 @@
+# Copyright (c) 2020 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+if BOARD_PIANTOR_PRO_BT_LEFT
+
+config ZMK_KEYBOARD_NAME
+	default "Piantor Pro BT"
+
+config ZMK_SPLIT_ROLE_CENTRAL
+    default y
+
+endif # BOARD_PIANTOR_PRO_BT_LEFT
+
+if BOARD_PIANTOR_PRO_BT_LEFT || BOARD_PIANTOR_PRO_BT_RIGHT
+
+config BOARD
+    default "piantor_pro_bt"
+
+config ZMK_SPLIT
+    default y
+
+if USB
+
+config USB_NRFX
+	default y
+
+config USB_DEVICE_STACK
+	default y
+
+endif # USB
+
+config BT_CTLR
+	default BT
+
+config I2C
+	default y
+
+config ZMK_MAX17048
+    default y
+
+endif # BOARD_PIANTOR_PRO_BT_LEFT || BOARD_PIANTOR_PRO_BT_RIGHT