[Keyboard] manta60 (#8068)

* manta60_update

* Update config.h

* Update config.h

* Update config.h

* Fixed info and readme

* Fixed config.h

* Fixed rules.mk

* Fixed keymap.c

* Update keyboards/manta60/rules.mk

Co-Authored-By: Drashna Jaelre <drashna@live.com>

* Fixed keymap.c

* Fixed rules.mk

* Update rules.mk

* Update keyboards/manta60/keymaps/default/keymap.c

Co-Authored-By: fauxpark <fauxpark@gmail.com>

* Update keyboards/manta60/keymaps/default/keymap.c

Co-Authored-By: fauxpark <fauxpark@gmail.com>

* Update keyboards/manta60/keymaps/default/keymap.c

Co-Authored-By: fauxpark <fauxpark@gmail.com>

* Update keyboards/manta60/keymaps/default/keymap.c

Co-Authored-By: fauxpark <fauxpark@gmail.com>

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

keyboards/manta60/keymaps/default/config.h

@@ -0,0 +1,21 @@
+/* Copyright 2020 kamonanban
+ *
+ * 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
+
+#define RGBLIGHT_SLEEP
+
+// place overrides here