[Keyboard] Added Cans12er keyboard (#7455)

* added cans12er keyboard

* updated readme

Updated the readme to conform with the provided template from the qmk_firmware githubpage

* Update keyboards/cans12er/README.md

Co-Authored-By: James Young <18669334+noroadsleft@users.noreply.github.com>

* Changed configuration

Changed the configuration based on the Change Request from PR #7455 made by github user noroadsleft

keyboards/handwired/cans12er/config.h

@@ -0,0 +1,38 @@
+#pragma once
+
+#include "config_common.h"
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID       0xFEED
+#define PRODUCT_ID      0x6060
+#define DEVICE_VER      0x0001
+#define MANUFACTURER    Can
+#define PRODUCT         cans12er
+#define DESCRIPTION     a simple 3x4 keypad. every part can be manufactured at home
+
+/* key matrix size */
+#define MATRIX_ROWS 3
+#define MATRIX_COLS 4
+
+/* key matrix pins */
+#define MATRIX_ROW_PINS { F7, B1, B3 }
+#define MATRIX_COL_PINS { D0, D4, C6, D7 }
+#define UNUSED_PINS
+
+/* COL2ROW or ROW2COL */
+#define DIODE_DIRECTION ROW2COL
+
+/* number of backlight levels */
+
+#ifdef BACKLIGHT_PIN
+#define BACKLIGHT_LEVELS 0
+#endif
+
+/* Set 0 if debouncing isn't needed */
+#define DEBOUNCE 5
+
+/* 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