[Keyboard] Abacus Keyboard ReMerge (#8308)

* added abacus keyboard

* keymap updates

* Update keyboards/abacus/config.h

* Update keyboards/abacus/config.h

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

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

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

* start cleaning up for merge

* cleaned for merge

* cleaned

* cleaned

* Update keyboards/abacus/abacus.h

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

* Update keyboards/abacus/keymaps/default/readme.md

* Update keyboards/abacus/readme.md

* Update keyboards/abacus/readme.md

* Update keyboards/abacus/rules.mk

* Update keyboards/abacus/info.json

* Update keyboards/abacus/info.json

* Update keyboards/abacus/info.json

* Update keyboards/abacus/readme.md

* Update keyboards/abacus/info.json

* Update keyboards/abacus/rules.mk

* Update keyboards/abacus/rules.mk

keyboards/abacus/abacus.c

@@ -0,0 +1,17 @@
+/* Copyright 2020 nickolaij
+ *
+ * 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 "abacus.h"