[Keyboard] Add ianklug grooveboard (#13536)

Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/ianklug/grooveboard/keymaps/via/keymap.c

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+/* Copyright 2021 ianklug
+ *
+ * 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/>.
+ */
+#include QMK_KEYBOARD_H
+
+// Defines names for use in layer keycodes and the keymap
+enum layer_names {
+    _BASE
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /* Base */
+    [_BASE] = LAYOUT(
+        KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT
+    ),
+	[1] = LAYOUT(
+        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
+    ),
+	[2] = LAYOUT(
+        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
+    ),
+	[3] = LAYOUT(
+        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
+    )
+};

keyboards/ianklug/grooveboard/keymaps/via/readme.md

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+# The via keymap for grooveboard

keyboards/ianklug/grooveboard/keymaps/via/rules.mk

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+VIA_ENABLE = yes
+LTO_ENABLE = yes