[Keyboard] Add earth_rover keyboard (#11405)

* Just ./util/new_keyboard.sh earth_rover

* Update readme.md

* Create key layout

* Setup config.h

* Add default keymap

* Fix pins

* Update flash command

* Write info.json

* Add reset instruction

* Change bootloader setting

* Format new C files

* Empty commit for kicking CI

* Update keyboards/earth_rover/config.h

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

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

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

* Update readme.md

* Update keyboards/earth_rover/readme.md

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

keyboards/earth_rover/keymaps/default/keymap.c

@@ -0,0 +1,31 @@
+/* Copyright 2020 k.bigwheel
+ *
+ * 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
+
+// Defines names for use in layer keycodes and the keymap
+enum layer_names { _BASE };
+
+// clang-format off
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /* Base */
+    [_BASE] = LAYOUT(
+              KC_A, KC_B,
+        KC_C, KC_D, KC_E, KC_F,
+        KC_G, KC_H, KC_I, KC_J,
+        KC_K, KC_L, KC_M, KC_N
+    )
+};
+// clang-format on