[Keyboard] Add pluto12 (#15369)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/psuieee/pluto12/keymaps/default/keymap.c

@@ -0,0 +1,23 @@
+// Copyright 2021 Will McGLoughlin (wymcg)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+// Defines names for use in layer keycodes and the keymap
+enum layer_names {
+    _BASE,
+    _FN
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [_BASE] = LAYOUT(
+        KC_PGUP,   KC_MUTE,   KC_VOLD,   KC_VOLU,
+        KC_PGDN,   KC_MPLY,   KC_MPRV,   KC_MNXT,
+        KC_NO,     KC_HOME,   KC_END,    OSL(_FN)
+    ),
+    [_FN] = LAYOUT(
+        KC_F1,     KC_F2,     KC_F3,     KC_F4,
+        KC_F5,     KC_F6,     KC_F7,     KC_F8,
+        KC_F9,     KC_F10,    KC_F11,    KC_F12
+    )
+};