[Keyboard] AJisai74 (#10021)

* Add keyboard ajisai74

Add ajisai74 keyboard.

A 74 keys ANSI/JIS Layout keyboard.
Salicylic-acid3

* Update keyboards/ajisai74/keymaps/salicylic/keymap.c

* Update keyboards/ajisai74/keymaps/via/keymap.c

* Update keyboards/ajisai74/keymaps/via/keymap.c

* Update keyboards/ajisai74/rules.mk

* Update keyboards/ajisai74/rev1/rev1.h

* Update keyboards/ajisai74/keymaps/default/keymap.c

* Update keyboards/ajisai74/keymaps/default/keymap.c

* Update keyboards/ajisai74/keymaps/jis/keymap.c

* Keymap update

Fixed an unnecessary symbol at the end of the file.

* Update keyboards/ajisai74/readme.md

* Update keyboards/ajisai74/rev1/config.h

* Delete Rev1 directory

I removed the directory because I don't have any plans to update now.

* Update keyboards/ajisai74/rules.mk

* Added copyright

Added copyright to all files.

* Update keyboards/ajisai74/ajisai74.h

keyboards/ajisai74/keymaps/default/config.h

@@ -0,0 +1,22 @@
+/* Copyright 2020 Salicylic_acid3
+ *
+ * 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
+
+/* Select hand configuration */
+
+#define TAPPING_FORCE_HOLD
+#define TAPPING_TERM 180