[Keyboard] Add keyboard "suihankey" (#6184)

* new keyboard suihankey

* set split keyboard

* set default keymap

* fix keymap

* update default rules.mk

* I erased what I didn't need.

* Fix default keymap

* fix config

* add keyboard image url

* Update readme.md

* update README.md

* add info.json

* Update keyboards/suihankey/readme.md

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

* remove default RGBLIGHT on

keyboards/suihankey/keymaps/default/config.h

@@ -0,0 +1,19 @@
+/* Copyright 2019 kakunpc
+ *
+ * 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
+
+// place overrides here