[Keyboard] Add TG4x (#7351)

* initial commit

* add pins and matrix

* add an appropriate keymap

* set bootloader to caterina

* add QMK Configurator support

* turn on RGB and link time optimization

* add rgb pin

* update readme on rgb underglow info

* Update keyboards/tg4x/readme.md

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

* Update keyboards/tg4x/readme.md

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

* Update keyboards/tg4x/readme.md

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

* setting product id to 1 to match original code

keyboards/tg4x/keymaps/default/keymap.c

@@ -0,0 +1,28 @@
+/* Copyright 2019 MechMerlin
+ *
+ * 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 QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [0] = LAYOUT( /* Base */
+        KC_ESC, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_MINS, KC_DEL,
+          KC_TAB, KC_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_J, KC_K, KC_L, KC_QUOT, KC_ENT,
+          KC_LSFT, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_RSFT,
+          KC_LCTL, KC_LGUI, KC_LALT, KC_SPACE, KC_SPACE, KC_RALT, KC_RGUI, KC_RCTL, KC_RCTL
+    ),
+};
+
+
+