[Keyboard] add leftover30 by marksard (#10140)

* Keyboard: add treeadstone48

* rename layout defines

* Use of pragma once

* move common include code

* fixed info.json

* change keymap layout from kc to normal

* fix alpha revision keymap

* fixed info.json

* remove USE_Link_Time_Optimization

* Add keyboard leftover30

* update keymap

* Update keyboards/marksard/leftover30/config.h

I guess I was mistaken. Thank you.

* Update keyboards/marksard/leftover30/keymaps/default/keymap.c

* Update keyboards/marksard/leftover30/leftover30.c

* Update keyboards/marksard/leftover30/keymaps/default/keymap.c

* Update keyboards/marksard/leftover30/keymaps/default/keymap.c

* Update keyboards/marksard/leftover30/keymaps/default/keymap.c

* Update keyboards/marksard/leftover30/keymaps/default/keymap.c

* Update keyboards/marksard/leftover30/keymaps/default/keymap.c

* Update keyboards/marksard/leftover30/keymaps/default/keymap.c

* Update keyboards/marksard/leftover30/keymaps/default/keymap.c

* Update keyboards/marksard/leftover30/keymaps/default/keymap.c

* Update keyboards/marksard/leftover30/keymaps/default/keymap.c

* changed user led custom method

* Update keyboards/marksard/leftover30/config.h

* Update keyboards/marksard/leftover30/config.h

* Update keyboards/marksard/leftover30/keymaps/default/rules.mk

* Update keyboards/marksard/leftover30/rules.mk

* Update from other review

* Update keyboards/marksard/leftover30/readme.md

* fixed kanji key procedure

* Update keyboards/marksard/leftover30/config.h

* Update keyboards/marksard/leftover30/config.h

* Update keyboards/marksard/leftover30/config.h

* fixed by review

1 files changed, 24 insertions, 0 deletions

diff --git a/keyboards/marksard/leftover30/keymaps/default/config.h b/keyboards/marksard/leftover30/keymaps/default/config.h
new file mode 100644
index 000000000..8bffbbb3b
--- /dev/null
+++ b/keyboards/marksard/leftover30/keymaps/default/config.h
@@ -0,0 +1,24 @@
+/* Copyright 2020 marksard
+ *
+ * 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
+#define TAPPING_TERM 200
+#define IGNORE_MOD_TAP_INTERRUPT
+
+#define TAPPING_LAYER_TERM 150 // Custom LT Tapping term
+#define TAPPING_TERM_PER_KEY