pull retropad out of handwired and update readme.md (#11545)

Co-authored-by: Swiftrax <swiftrax@gmail.com>

keyboards/swiftrax/retropad/config.h

@@ -0,0 +1,64 @@
+/*
+Copyright 2020 Swiftrax <swiftrax@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/>.
+*/
+
+#pragma once
+
+#include "config_common.h"
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID       0x04D8
+#define PRODUCT_ID      0xEB0C
+#define DEVICE_VER      0x0001
+#define MANUFACTURER    Swiftrax
+#define PRODUCT         Retropad
+
+/* key matrix size */
+#define MATRIX_ROWS 3
+#define MATRIX_COLS 2
+
+// ROWS: Top to bottom, COLS: Left to right
+
+#define MATRIX_ROW_PINS { C7, C6, B5 }
+#define MATRIX_COL_PINS { B4, D2 }
+
+#define ENCODERS_PAD_A { D0 }
+#define ENCODERS_PAD_B { D1 }
+
+/* COL2ROW or ROW2COL */
+#define DIODE_DIRECTION COL2ROW
+
+#define RGB_DI_PIN B7
+#ifdef  RGB_DI_PIN
+#define RGBLIGHT_ANIMATIONS
+#define RGBLED_NUM 6
+#define RGBLIGHT_HUE_STEP 8
+#define RGBLIGHT_SAT_STEP 8
+#define RGBLIGHT_VAL_STEP 8
+#endif
+
+/* define if matrix has ghost */
+//#define MATRIX_HAS_GHOST
+
+/* Set 0 if debouncing isn't needed */
+#define DEBOUNCE 5
+
+/*EEPROM for via*/
+#define DYNAMIC_KEYMAP_LAYER_COUNT 3
+
+/* bootmagic row col assignment */
+#define BOOTMAGIC_LITE_ROW 1
+#define BOOTMAGIC_LITE_COLUMN 0