[Keyboard] Add 40percent.club's 'polypad' PCB (#15158)

Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: Sergey Vlasov <sigprof@gmail.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>

keyboards/40percentclub/polyandry/promicro/config.h

@@ -0,0 +1,34 @@
+/* Copyright 2021
+ *
+ * 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"
+
+/* key matrix size */
+#define MATRIX_ROWS 1
+#define MATRIX_COLS 12
+
+/* key matrix pins 
+ * Direct pins is not used because there is not a shared ground position
+ * between all compatible microcontrollers.
+*/ 
+#define MATRIX_ROW_PINS { D7 }
+#define MATRIX_COL_PINS { D1, D0, D4, C6, E6, B4, F4, F5, F6, F7, B3, B2 }
+#define UNUSED_PINS
+
+/* doesn't really matter lol */
+#define DIODE_DIRECTION COL2ROW