Add support for MacroCat Keyboard (#17480)

keyboards/macrocat/keymaps/default/keymap.c

@@ -0,0 +1,19 @@
+// Copyright 2022 catmunch (@catmunch)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [0] = {
+        {KC_PLUS,   KC_9,       KC_8,   KC_7 },
+        {KC_MINS,   KC_6,       KC_5,   KC_4 },
+        {KC_DOT,    KC_3,       KC_2,   KC_1 },
+        {KC_ENT,    KC_SPACE,   KC_0,   MO(1)}
+    },
+    [1] = {
+        {KC_ASTR,   KC_MPRV,    KC_MPLY,KC_MNXT},
+        {KC_SLSH,   KC_LPRN,    KC_UP,  KC_RPRN},
+        {KC_COMM,   KC_LEFT,    KC_DOWN,KC_RIGHT},
+        {KC_TAB,    KC_BSPC,    KC_0,   KC_TRNS}
+    }
+};