Keyboard: Ported ADB-to-USB converter from TMK to QMK (#3931)

* Ported ADB-to-USB converter from TMK to QMK

* Updated pull request with reviewer suggestions.

* Removed precompiled header file type (gch) from gitignore per reviewer request

* Update keyboards/converter/adb_usb/matrix.c

Changed instances of matrix_init_quantum to matrix_scan_quantum.

* Update keyboards/converter/adb_usb/matrix.c

Co-Authored-By: 13-bit <pete@13bit.me>

keyboards/converter/adb_usb/config.h

@@ -0,0 +1,43 @@
+/*
+Copyright 2011 Jun Wako <wakojun@gmail.com>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Ported to QMK by Peter Roe <pete@13bit.me>
+*/
+
+#pragma once
+
+#define VENDOR_ID       0xFEED
+#define PRODUCT_ID      0x0ADB
+#define DEVICE_VER      0x0101
+#define MANUFACTURER    QMK
+#define PRODUCT         ADB keyboard converter
+#define DESCRIPTION     Convert ADB keyboard to USB
+
+/* matrix size */
+#define MATRIX_ROWS 16  // keycode bit: 3-0
+#define MATRIX_COLS 8   // keycode bit: 6-4
+
+/* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */
+#define LOCKING_SUPPORT_ENABLE
+/* Locking resynchronize hack */
+#define LOCKING_RESYNC_ENABLE
+
+/* ADB port setting */
+#define ADB_PORT        PORTD
+#define ADB_PIN         PIND
+#define ADB_DDR         DDRD
+#define ADB_DATA_BIT    0
+//#define ADB_PSW_BIT     1       // optional