Russian typewriter keymap file for popular legacy layout (#21174)

Co-authored-by: Andrei Tutolmin <andrei@tutolmin.com>

quantum/keymap_extras/keymap_russian_typewriter.h

@@ -0,0 +1,93 @@
+// Copyright 2023 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+/*******************************************************************************
+  88888888888 888      d8b                .d888 d8b 888               d8b
+      888     888      Y8P               d88P"  Y8P 888               Y8P
+      888     888                        888        888
+      888     88888b.  888 .d8888b       888888 888 888  .d88b.       888 .d8888b
+      888     888 "88b 888 88K           888    888 888 d8P  Y8b      888 88K
+      888     888  888 888 "Y8888b.      888    888 888 88888888      888 "Y8888b.
+      888     888  888 888      X88      888    888 888 Y8b.          888      X88
+      888     888  888 888  88888P'      888    888 888  "Y8888       888  88888P'
+                                                        888                 888
+                                                        888                 888
+                                                        888                 888
+     .d88b.   .d88b.  88888b.   .d88b.  888d888 8888b.  888888 .d88b.   .d88888
+    d88P"88b d8P  Y8b 888 "88b d8P  Y8b 888P"      "88b 888   d8P  Y8b d88" 888
+    888  888 88888888 888  888 88888888 888    .d888888 888   88888888 888  888
+    Y88b 888 Y8b.     888  888 Y8b.     888    888  888 Y88b. Y8b.     Y88b 888
+     "Y88888  "Y8888  888  888  "Y8888  888    "Y888888  "Y888 "Y8888   "Y88888
+         888
+    Y8b d88P
+     "Y88P"
+*******************************************************************************/
+
+#pragma once
+#include "keycodes.h"
+// clang-format off
+
+// Aliases
+#define RU_PIPE KC_GRV  // |
+#define RU_NUM  KC_1    // №
+#define RU_MINS KC_2    // -
+#define RU_SLSH KC_3    // /
+#define RU_DQUO KC_4    // "
+#define RU_COLN KC_5    // :
+#define RU_COMM KC_6    // ,
+#define RU_DOT  KC_7    // .
+#define RU_UNDS KC_8    // _
+#define RU_QUES KC_9    // ?
+#define RU_PERC KC_0    // %
+#define RU_EXLM KC_MINS // !
+#define RU_SCLN KC_EQL  // ;
+#define RU_SHTI KC_Q    // Й
+#define RU_TSE  KC_W    // Ц
+#define RU_U    KC_E    // У
+#define RU_KA   KC_R    // К
+#define RU_IE   KC_T    // Е
+#define RU_EN   KC_Y    // Н
+#define RU_GHE  KC_U    // Г
+#define RU_SHA  KC_I    // Ш
+#define RU_SHCH KC_O    // Щ
+#define RU_ZE   KC_P    // З
+#define RU_HA   KC_LBRC // Х
+#define RU_HARD KC_RBRC // Ъ
+#define RU_RPRN KC_BSLS // )
+#define RU_EF   KC_A    // Ф
+#define RU_YERU KC_S    // Ы
+#define RU_VE   KC_D    // В
+#define RU_A    KC_F    // А
+#define RU_PE   KC_G    // П
+#define RU_ER   KC_H    // Р
+#define RU_O    KC_J    // О
+#define RU_EL   KC_K    // Л
+#define RU_DE   KC_L    // Д
+#define RU_ZHE  KC_SCLN // Ж
+#define RU_E    KC_QUOT // Э
+#define RU_YA   KC_Z    // Я
+#define RU_CHE  KC_X    // Ч
+#define RU_ES   KC_C    // С
+#define RU_EM   KC_V    // М
+#define RU_I    KC_B    // И
+#define RU_TE   KC_N    // Т
+#define RU_SOFT KC_M    // Ь
+#define RU_BE   KC_COMM // Б
+#define RU_YU   KC_DOT  // Ю
+#define RU_YO   KC_SLSH // Ё
+#define RU_PLUS S(RU_PIPE) // +
+#define RU_1    S(RU_NUM)  // 1
+#define RU_2    S(RU_MINS) // 2
+#define RU_3    S(RU_SLSH) // 3
+#define RU_4    S(RU_DQUO) // 4
+#define RU_5    S(RU_COLN) // 5
+#define RU_6    S(RU_COMM) // 6
+#define RU_7    S(RU_DOT)  // 7
+#define RU_8    S(RU_UNDS) // 8
+#define RU_9    S(RU_QUES) // 9
+#define RU_0    S(RU_PERC) // 0
+#define RU_EQL  S(RU_EXLM) // =
+#define RU_BSLS S(RU_SCLN) // (backslash)
+#define RU_LPRN S(RU_RPRN) // (
+#define RU_RUBL ALGR(RU_UNDS) // ₽
+