[Keyboard] Add support for Southpaw Full Size (#8029)

* Begin work on spfs, migrating ancient config

* QMK breaks if there's a dash in the board name

* Update info.json

* Make indicator LEDs work

* Build a readme

* Change title to match official GB thread name

* Add an ANSI WKL layout for simplicity

* Adjustments as per pullreq recommendations

* Remove unused functions from other keymap

keyboards/switchplate/southpaw_fullsize/southpaw_fullsize.c

@@ -0,0 +1,51 @@
+/* Copyright 2020 Ryota Goto
+ *
+ * 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 "southpaw_fullsize.h"
+
+// Optional override functions below.
+// You can leave any or all of these undefined.
+// These are only required if you want to perform custom actions.
+
+#define INDICATOR_NUM D3
+#define INDICATOR_CAPS D4
+#define INDICATOR_SCR D5
+
+
+void matrix_init_kb(void) {
+    // put your keyboard start-up code here
+    // runs once when the firmware starts up
+
+    // D3 Numlock, D4 Capslock, D5 Scrlock
+    setPinOutput(INDICATOR_NUM);
+    setPinOutput(INDICATOR_CAPS);
+    setPinOutput(INDICATOR_SCR);
+
+    matrix_init_user();
+}
+
+bool led_update_kb(led_t led_state) {
+    // put your keyboard LED indicator (ex: Caps Lock LED) toggling code here
+    bool res = led_update_user(led_state);
+    if (res)
+    {
+        writePin(INDICATOR_NUM, !led_state.num_lock);
+        writePin(INDICATOR_CAPS, !led_state.caps_lock);
+        writePin(INDICATOR_SCR, !led_state.scroll_lock);
+    }
+    return res;
+}
+