[Keyboard] move reviung keyboards to a directory (#15636)

keyboards/reviung/reviung5/keymaps/default/keymap.c

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+/* Copyright 2021 gtips
+ *
+ * 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,
+    _LOWER,
+};
+
+#define LO_VD LT(_LOWER, KC_VOLD)
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /* Base */
+    [_BASE] = LAYOUT_reviung5(
+        LO_VD,         KC_MPRV,       KC_MPLY,       KC_MNXT,       KC_VOLU
+    ),
+    [_LOWER] = LAYOUT_reviung5(
+        _______,       RGB_HUI,       RGB_MOD,       RGB_TOG,       KC_MUTE
+    )
+};

keyboards/reviung/reviung5/keymaps/default/readme.md

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+# The default keymap for reviung5