[Keyboard] Add Rabbit68 Keyboard w/ default,kaiec keymaps. (#6676)

* Add Rabbit68 Keyboard w/ default,kaiec keymaps.

* Requested changes by @fauxpark

* Change flash command, as suggested by @drashna

* Update keyboards/rabbit/rabbit68/readme.md

Co-Authored-By: Drashna Jaelre <drashna@live.com>

* Add link to Github repo 

As I per suggestion changed the link above to an image, I added now the link to the project page to the Open Source text, where it actually makes the most sense.

keyboards/rabbit/rabbit68/keymaps/kaiec/config.h

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+/* Copyright 2019 Kai Eckert
+ *
+ * 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

keyboards/rabbit/rabbit68/keymaps/kaiec/keymap.c

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+/* Copyright 2019 Kai Eckert
+ *
+ * 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 the keycodes used by our macros in process_record_user
+// enum custom_keycodes { QMKBEST = SAFE_RANGE, QMKURL };
+
+
+#define _BASE 0
+#define _FN 1
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [_BASE] = LAYOUT(
+  KC_GRV,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_MINS, KC_EQL,  KC_BSPC,
+  KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_LBRC, KC_RBRC, KC_BSLS,
+  KC_CAPS, KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT, KC_ENT,  KC_PGUP,
+  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_UP,   KC_PGDN,
+  KC_LCTL, KC_LGUI, KC_LALT, KC_NO,            KC_SPC,  KC_SPC,           KC_RALT, MO(_FN), KC_NO,   KC_LEFT, KC_DOWN, KC_RIGHT
+  ),
+    [_FN] = LAYOUT(
+  _______, KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  _______, _______, _______,
+  _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+  _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+  _______, _______, _______, _______, _______, _______, _______, _______, KC_VOLD, KC_VOLU, KC_MUTE, _______, _______, _______,
+  _______, _______, _______, _______,          _______, _______,          _______, _______, _______, _______, _______, _______ 
+  ),
+};

keyboards/rabbit/rabbit68/keymaps/kaiec/readme.md

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+# Kaiec's personal keymap
+
+- US Layout 
+- Y and Z switched (to be closer to German layout)
+- Right Alt plus AOUS produces German umlauts
+- Escape produces `~ (as this is mapped back to ESC on OS level)